win32/arm64: add native Windows ARM64 support

[bold84]

Summary

• add native Windows ARM64 target support across configure, build, PE, CRT, and runtime paths
• add hosted Windows ARM64 -run support, including argv, wargv, env, wenv, stdin, exit, nested -run, backtrace, and libtcc regression coverage
• add GNU-style ARM64 extended inline asm support, plus ARM64 encoding and error regression tests
• import grischka's Windows helper files and test hooks (tests/msvcrt_start.c, tests/test-win32.bat, win32/lib/winex.c)

Notes

• this is the cleaned win_arm64_reviewable series, rebased onto oven-sh/mob to keep the review diff focused on the Windows ARM64 work
• the branch keeps the currently validated functionality and test coverage rather than reducing scope to minimize diff size

Validation

• win32\build-tcc.bat -t arm64 -c clang
• .\tcc -B. ..\win32\test_arm64.c -o test_arm64.exe && .\test_arm64.exe
• Set-Content test_rstdin.txt 'arm64 stdin'; .\tcc -B. -rstdin test_rstdin.txt -run ..\win32\test_rstdin.c
• .\tcc -B. ..\tests\tests2\49_bracket_evaluation.c -o test49.exe && .\test49.exe
• .\tcc -B. -run ..\win32\test_run_argv.c alpha "two words" beta
• clang -O0 -I.. ..\win32\test_run_arg_cleanup.c -o test_run_arg_cleanup.exe && .\test_run_arg_cleanup.exe alpha beta gamma
• make test -k
• make -C tests test2 test3
• tests\test-win32.bat -p ..\.. -c clang -t arm64

[coderabbitai]

Caution

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Walkthrough

This pull request adds comprehensive ARM64/AArch64 assembler and code-generation support for Windows PE targets, alongside extensive Windows ARM64 runtime, startup, and test infrastructure. It replaces the ARM64 dummy assembler with a functional backend supporting inline assembly, instruction encoding, and relocation handling, while extending build configuration, CI testing, and test coverage.

Changes

Cohort / File(s)	Summary
Workflow and Build Configuration .github/workflows/build.yml, Makefile, configure, lib/Makefile	Enhanced CI/build system with expanded Windows test targets (MSYS2/CLANG64, ARM64), new test suite targets (tests2 subsets), and refactored native/cross-compilation target detection for ARM64 on Windows.
ARM64 Assembler and Token Definitions arm64-asm.c, arm64-tok.h	Replaced dummy ARM64 assembler with full functional implementation: instruction dispatch, operand parsing (registers, immediates, addresses, condition codes), instruction encoders, constraint allocation, and inline-asm support for loads/stores, branches, moves, arithmetic, and system instructions.
ARM64 Code Generation and Relocation arm64-gen.c, arm64-link.c	Refactored instruction encoding with ARM64 macro constants, PE-specific symbol materialization and relocation handling (ADRP/ADD), stack adjustment via __chkstk, vararg/PCS handling improvements, HFA struct support, and extended relocation types (CONDBR19, TSTBR14).
Runtime Support and Exception Handling lib/bcheck.c, lib/bt-dll.c, lib/bt-exe.c, lib/libtcc1.c, libtcc.c, tcc.c, tccrun.c	Added Windows ARM64-specific runtime features: environment variable retrieval, backtrace formatting/symbolization, process-scoped DLL tracking, run-argv offset tracking, exception context restoration from jump buffer, and I/O flushing.
Compiler Infrastructure and Type System tccasm.c, tccgen.c, tccpp.c, tccpe.c, tcctok.h, include/tccdefs.h, tcc.h, tcc-doc.texi	Extended assembler comment handling for ARM64, typedef-derived alignment tracking in struct fields, ARM64 operand modifiers, new MinGW setjmp/longjmp tokens, ARM64-specific va_list definition for Windows, PE export parsing for ARM64 images, unwind metadata refactoring, and symbol attribute/state structure extensions.
Windows Headers and Platform Definitions win32/include/_mingw.h, win32/include/setjmp.h, win32/include/stdlib.h, win32/include/winapi/winnt.h	Added ARM64 architecture detection and macro definitions, ARM64 _JUMP_BUFFER and CONTEXT structures, __mingw_setjmp/__mingw_longjmp declarations, _get_environ/_get_wenviron CRT exports, ARM64 PE machine ID, and DLL characteristics constants.
Windows Startup and Runtime Libraries win32/lib/chkstk.S, win32/lib/crt1.c, win32/lib/runmain-arm64.S, win32/lib/runrt.c, win32/lib/wincrt1.c, win32/lib/winex.c	Implemented ARM64-specific stack-probing (__chkstk), process-exit handler registration (__tcc_run_on_exit/atexit), Windows -run argument/environment handling with thread-local state, destructor invocation, and global CRT symbol definitions for ARM64.
Windows Build and Test Scripts win32/build-tcc.bat, tests/test-win32.bat	Enhanced batch-based build system with MSYS2 clang64 support, dynamic compiler/architecture selection, ARM64 library compilation with runrt.o, assembly helper builds, and test harness initialization.
Test Infrastructure tests/Makefile, tests/pp/Makefile, tests/libtcc_test_mt.c, tests/asm/test-*.c, tests/msvcrt_start.c, tests/tcctest.c	Added ARM64 inline-assembly test suite, reference output selection logic based on architecture/toolchain/UCRT, Windows sleep API declaration, MSVCRT dynamic-link test harness, and adjusted compile-time guards for platform-specific tests.
Test Reference Outputs tests/test.ref.win32-arm64, tests/test.ref.win32-x86_64-ucrt, tests/tests2/138_arm64_encoding.*, tests/tests2/139_arm64_errors.*, tests/tests2/73_arm64.*, win32/test_*.ref	Golden-output files for ARM64 encoding/error testing, HFA struct argument passing, and Windows command-line/environment argument handling validation.
Windows Test Programs win32/test_*.c	Comprehensive suite of ARM64-specific test programs: basic arithmetic, inline assembly, backtrace validation, libtcc runtime context preservation, PE field alignment, stdin/stdout I/O, argument/environment variable handling, and exit-handler cleanup.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'win32/arm64: add native Windows ARM64 support' clearly and specifically identifies the main change—adding Windows ARM64 target support—and is directly related to the large changeset covering configure, build, PE, CRT, runtime, inline-asm, and test additions.
Description check	✅ Passed	The description is well-detailed and directly related to the changeset, covering native Windows ARM64 support, hosted -run functionality, inline-asm support, test coverage, and imports from helper files—all topics present in the file summaries.

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[jcompagner]

is this (or something like this) planning to be merged into tinycc?
Because we now get very nice development machines (Asus Zenbook A16) where i now work on but this kind of arm64 is not supported is a pity to have

does the original tinycc not already kind of support this now?
TinyCC@30afb50