macho: implement growSection mechanism

macho: implement more self-hosted primitives

macho: set alignment of pre-allocated sections

macho: init metadata for incremental linking

macho: add __zig_got section implementation

macho: re-implement updateDeclCode

macho: init metadata and partially implement updateDecl

macho: create Atom for Decl in ZigObject

macho: split symbol.flags.got into needs_got and has_got

macho: forward parsed -compatibility_version to the linker

macho: patch up more holes with ZigObject

macho: move all unimplemented function stubs into ZigObject

macho: introduce ZigObject

test/link/macho: migrate all tests to the new test matrix

test/link/macho: upgrade tbdv3 test

test/link/macho: upgrade unwind info tests

test/link/macho: test stacksize option

test/link/macho: upgrade search strategy test

test/link/macho: test re-exports in zig

test/link/macho: remove converted standalone tests

test/link/macho: test pagezero size

test/link/macho: revert testing objc msgsend stubs - no way of enabling in clang

test/link/macho: test objc msgsend selector stubs

test/link/macho: use .root_module. instead of wrappers where possible

test/link/macho: test force-loading objects containing ObjC from archives

test/link/macho: test no exports in a dylib

test/link/macho: test attribute "used" on vars in presence of dead_strip

test/link/macho: upgrade strict validation of layout test

test/link/macho: upgrade entry and entry in archive tests

test/link/macho: upgrade empty object test

test/link/macho: upgrade dylib test

macho: remove all rpath parsing from the linker

macho: print all definitions of symbols when printing duplicates

test/link/macho: upgrade dead_strip_dylibs test

test/link/macho: test -r mode

test/link/macho: test tentative definitions

test/link/macho: upgrade tls test

test/link/macho: test thunks on arm64

test/link/macho: test twolevel namespacing

test/link/macho: test large .tbss section

test/link/macho: test -u flag handling (forceUndefinedSymbol)

test/link/macho: upgrade weak framework test

test/link/macho: upgrade weak library test

test/link/macho: test weak binding

test/link/macho: upgrade and migrate headerpad test

test/link/macho: test setting correct weak* flags in the header

test/link/macho: test hello world in C

test/link/macho: test hello world in Zig

test/link/macho: test for correct handling of large __bss sections

test/link/macho: test for correct handling of __mh_execute_header symbol

test/link/macho: upgrade and migrate needed_library test

test/link/link: pass build options to elf and macho tests

test/link/macho: test segment boundary symbols

test/link/macho: fix naming in entry-in-dylib test

test/link/macho: upgrade and migrate dead_strip test

test/link/elf: make invalid input file test less janky

macho: fix invalid generation of FDE records

test/link/macho: migrate entry_in_dylib test to new test format

macho: preserve section name for code sections

macho: fix section boundary symbols test

macho: parse dependent dylibs

macho: fix dead stripping logic to exclude debug sections

macho: re-instate build-obj codepath

macho: report duplicate symbols

macho: write to file

macho: allocate sections, segments and atoms

macho: sort sections; use Atom.Alignment for alignment; init segments

macho: init output and synthetic sections

macho: report undefined symbols to the user

macho: set dylib ordinals after pruning

macho: dead strip dylibs

macho: mark imports and exports

macho: handle dead stripping of atoms

macho: claim unresolved symbols

macho: convert tentative defs and create objc sections

macho: resolve synthetic symbols

macho: resolve symbols and mark files live

macho: init InternalObject and add forced undefined globals

macho: prep for dylib deps (no resolution yet)

macho: parse tbds

macho: parse dylibs

macho: parse archives

macho: create scaffolding for parsing different input objects

macho: parse an input object file!

macho: re-enable --verbose-link

macho: get the ball rolling!

macho: copy over new implementation sources from zld

Merge pull request #17155 from winterqt/ignore-nix-ldflags-linkage-directives

Revert "Don't assume a write if an operand is not in function parameters"

Don't assume a write if an operand is not in function parameters

os.windows: Fix error 258 name in Win32Error

std.fmt: fix unecessary deref on user-defined format function

Sema: use Sema.typeAbiSize rather than Type.abiSize

std.process: return u64 in totalSystemMemory

objcopy ofmt=hex iterates through segments instead of sections

Sema: implement comptime error return traces

Fix wrong if condition for windows (#18637)

Free threads in std.Thread.Pool.init only with pool.join

std.io: replace readStructBig with readStructEndian

Merge pull request #18644 from ziglang/langref