[X86,MC] Add relocation R_X86_64_REX2_GOTPCRELX (#106681) For mov name@GOTPCREL(%rip), %reg test %reg, name@GOTPCREL(%rip) binop name@GOTPCREL(%rip), %reg where binop is one of adc, add, and, cmp, or, sbb, sub, xor instructions, add `R_X86_64_REX2_GOTPCRELX`/`R_X86_64_CODE_4_GOTPCRELX` = 43 if the instruction starts at 4 bytes before the relocation offset. It similar to R_X86_64_GOTPCRELX. Linker can treat `R_X86_64_REX2_GOTPCRELX`/`R_X86_64_CODE_4_GOTPCRELX` as `R_X86_64_GOTPCREL` or convert the above instructions to lea name(%rip), %reg mov $name, %reg test $name, %reg binop $name, %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/3d5a60de52556f6a53d71d7e607c6696450ae3e4 Binutils mailthread: https://sourceware.org/pipermail/binutils/2023-December/131462.html ABI discussion: https://groups.google.com/g/x86-64-abi/c/KbzaNHRB6QU Blog: https://kanrobert.github.io/rfc/All-about-APX-relocation
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