[X86][MC] Add R_X86_64_CODE_4_GOTTPOFF (#116633) For mov name@GOTTPOFF(%rip), %reg add name@GOTTPOFF(%rip), %reg add `R_X86_64_CODE_4_GOTTPOFF` = 44 if the instruction starts at 4 bytes before the relocation offset. It's similar to R_X86_64_GOTTPOFF. Linker can treat `R_X86_64_CODE_4_GOTTPOFF` as `R_X86_64_GOTTPOFF` or convert the instructions above to mov $name@tpoff, %reg add $name@tpoff, %reg if the first byte of the instruction at the relocation `offset - 4` is `0xd5` (namely, encoded w/REX2 prefix) when possible. Binutils patch: https://github.com/bminor/binutils-gdb/commit/a533c8df598b5ef99c54a13e2b137c98b34b043c Binutils mailthread: https://sourceware.org/pipermail/binutils/2023-December/131463.html ABI discussion: https://groups.google.com/g/x86-64-abi/c/ACwD-UQXVDs/m/vrgTenKyFwAJ Blog: https://kanrobert.github.io/rfc/All-about-APX-relocation
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