Some initial work on x32 and n32 ABI support #21717
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This is needed for muslx32 and muslabin32 support.
Once we upgrade to LLVM 20, these should be lowered verbatim rather than to simply musl. Similarly, the special case in llvmMachineAbi() should go away.
Adds mips64-linux-muslabin32 and x86_64-linux-muslx32 headers.
Adds mipsn32 and x32 sources. Also remove some useless .in files.
With this, MIPS triples for musl are in line with glibc triples.
This fixes an X86_64_32 relocation linker error when targeting gnux32.
Also update the syscalls file based on Linux 6.10. No diffs other than x32.
LLVM doesn't even recognize the gnuilp32 spelling as an alternative.
This was referenced Oct 27, 2024
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First round of patches towards #21711 and #21712.
zig ccis now ~fully functional forx86_64-linux-(gnu,musl)x32andmips64(el)-linux-(gnu,musl)abin32.mips64(el)-linux-musltriples have been changed tomips64(el)-linux-muslabi64to be consistent with the glibc triples.dlstart.chadn't been updated for 1.2.5?).Next step is to port the standard library, then get tests passing under QEMU (for n32 anyway; there seems to be no QEMU for x32).