* fixed dwarf debug info after 0040398 (mantis 0034622)

Change default debugging format for x86_64-haiku to dwarf-2, as stabs is normally disabled on 64-bit systems

* added extra header to ppu inside a subsection, so we won't run into
trouble when the ppu version hits 255
* also moved several ppu flags to a set inside that section

* append rather than insert the alias symbols for the program/procedure
initialisation/finalisation routines
o this ensures the procdef's mangled name and its first symbol match,
which is required for Darwin when generating debug information and
using ".set" directives to define alias symbols, because a symbol
defined via ".set" cannot be used in a data relocations (and the DWARF
debug generator uses the default mangled name, which used to correspond
to the alias symbol due to the "insert" instead of "append")

* some runtime errors fixed, if compiled with -CrR

* arm-linux uses dwarf debug info by default

+ dwarf support for tls threadvars

* several linux targets switches from stabs to dwarf

* moved array stride back to array entry (mantis 0036144)

* fix Dwarf 3 array location broken in 0043171 (fix by Martin Friebe,
mantis 0036144)

* Add riscv-embedded to targets that don't support non-constant leb128's.

* generate CFI data only if we're either using it for exception handling or if debug output is enabled (or should this only be generated for targets that in theory support DWARF exception handling?). This removes unnecessary bloat from e.g. Windows binaries

* patch by Marģers to unify internal error numbers, resolves 0037888

* the size of the CIE_pointer in an FDE is always 32 bit

* arm thumb: generate proper cfi

* initial implementation of CFI support for arm (non-thumb)

* generate advance_loc records only if there was code/data since the last advance_loc entry

+ (safe) heuristics to use DW_CFA_advance_loc1 in CFI

+ generate initial cfi for aarch64

* support Objective-C classes and protocols with -gw3 (mantis 0036250)

* RiscV: basic CFI stuff fixed

* Dwarf: write variant fields only if the require features are present, resolves 0038651

* don't generate high-level CFI statements when the selected assembler
does not support them, even if the target normally uses them
o fixes assembling with -Aas-darwin for i386/arm/x86-64 (on OS
versions that used those)

* moved a bunch of constants from dbgdwarf to dbgdwarfconst

* patch by Dean Mustakino to avoid generation of debug info for generics, resolves gitlab 0038827
+ test

* Removed unused parameter

* Section-offsets have 64 bits in the Dwarf-64 format

LLVM: enable DWARF debug info generation

llvmdbg: initial version based on dbgdwarf

Line information is mostly functional, type information not yet (except
for basic procdef info, as that's required for line info)

TSymStr: more consistent usage

llvmdbg: remove some commented dbgdwarf code

Also adjusted some hashtable sizes

* increase default dwarf version for linux targets where current distributions exist

dbgllvm: remove tmembercallbackinfo

Leftover from dbgdwarf, not used here

darwin: also run dsymutil for DWARF 4

* do not use Dwarf-4 yet as it is too little tested and has no benefits

* handle absolute on strings correctly for dwarf debug info, resolves gitlab 0039816

* Always generate CFI-information. During linking it can be omitted when
no debug-information is requested. On Linux this needed a change in the
linker-script. On Windows it already works as desired. Other targets
may need some adjustments as well.

+ support writing of 32-bit and 64-bit relocations in the REL object writer
for Z80. This fixes DWARF debug output and makes it behave consistently with
the Z80 external assembler writer.

+ added custom section descriptions for DWARF debug info for the WebAssembly object writer (not actually emitted, yet)

+ write the actual DWARF debug sections in the WebAssembly object writer. The relocations aren't ready, yet, though.

+ emit WASM DWARF debug info relocations

* workaround crash when generating WebAssembly DWARF debug info for threadvars, while multithreading is turned off

* use append_object_struct also for dwarf-3 when creating dwarf debug info for objects, resolves gitlab 0039920

* improve dwarf cfi on avr

* cfi for avr needs 32 bit pc begin and range

* TDebugInfoDwarf3.appenddef_object should not write an extra finish_entry for objects and C++ classes

Fix incorrect dwarf entry count. Issue gitlab 0039928 introduced in 1b6982107f1ac4b4111e37be0a3649d155a2bc1e

* fix life information propagation for while loops, resolves gitlab 0039971
* warnings/errors fixed which are caused by the new life information propagation
+ test

Darwin: really fix -Xg for DWARF4

dwarf-eh: don't emit header if there's no data to emit

Add dwarf cfa support

Add loongarch64 architecture support to compiler

* only i386 uses same special fastcall calling convention

Darwin: support -Xg for DWARFv4

riscv32-freertos:
* unit name fixed
* linker script fixed
* assembler supports dwarf

* don't not generate non-constant leb128 entriesm for riscv32-freertos

* Dotted RTL compiles

* write types declared in the interface section with a DW_AT_external tag, should resolve gitlab 0040210

* revert use of DW_AT_external for types as this is not covered by the dwarf standard

* spelling fixed

* correctly name nested enum type debug symbols, resolves gitlab 0040462

* Do not use namespace prefix for lnfodwarf

+ generate DWARF debug info for WebAssembly locals

Avoid range check error in AddNormalStringDef

Use reverse_byte to write constant sets in cross-endian configuration

* Introduce constwresourcestring - in unicode mode, resource strings are unicode strings, and must be streamed differently

const array - reducing unnecessary data copying

Reuse DWARF buffer on seeks.

* generate debuginfo for WebAssembly threadvars like for normal vars, when
WebAssembly threads are turned off

+ WebAssembly DWARF debug info: generate DW_AT_frame_base entries for functions

+ WebAssembly internal linker: support data relocations to threadvars, resolve
them as relative values to the beginning of the TLS section. Will be used for
generating debug info for threadvars.

+ generate proper reference to the TLS_BASE_SYM global in the WebAssembly debug info for threadvars

- removed redundant if

* create a TWasmGlobalAsmSymbol instead of TAsmSymbol when generating debug info
for thread vars. This fixes a memory corruption error, when later the compiler
tries to access the extra fields in TWasmGlobalAsmSymbol for the '__tls_base'
symbol.

* fixed blocksize when generating debug info for WebAssembly threadvars

* fix the final entry size in the .debug_aranges table on platforms where the
ALU size differs from the address size (such as WebAssembly 32-bit)

* WebAssembly internal assembler writer: generate the function locals header
when assembling the tai_local directive, instead of injecting them manually in
TWasmObjOutput.WriteFunctionCode. This makes function code offsets correct
and avoids the need to manually adjust relocation fixups by adding the locals
header size. It also fixes relative relocations, used in DWARF debug line
info.

+ introduced LINE_RANGE constant in the DWARF debug info generation unit

WebAssembly debug info: use different LINE_BASE and LINE_RANGE on WebAssembly to
improve compatibility with WasmTime's debugger support

* WebAssembly debug info: make wasmtime happy by not emitting line info end
sequences for procedures that lack any debug lines emitted previously

- WebAssembly code generator: removed the g_fingerprint hack, that added 4
useless i64 constants on the stack with random numbers and then drop them. It
was used for primitive debugging, since previously it wasn't possible to
identify the function name. Now we can produce DWARF debug info, as well as a
"names" custom section to give each function a name and most WebAssembly
environments support at least one of the two mechanisms. Therefore the
g_fingerprint hack is no longer necessary.

* DWARF line info: only use the cached module if the base address also is the same; this can happen if the initial exception occurred at a random address outside the module, but the next stack address can be found inside the correct module

* WebAssembly internal linker: invoke helper code generation moved earlier,
before the relocation fixups are applied. This should make the DWARF debug
line info correct again. Also, the offsets in the linker map file should be
correct now, as well.

* Dwarf: write enum symbol constants with the size of the enum, as proposed in gitlab 0041021

* Dwarf 3+: write always a type for enums

* stabs is getting removed from gdb, so make dwarf the default debugging format for most
linux targets excepts ones not really supported anymore. resolves gitlab 0041474

compiler: set to nil after free

compiler: set to nil after free

Mass typo fixes in comments for compiler.

CloseDwarf is public, so lock.

Speed up DWARF processing...