Kernel ELF Linker: Implement R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX relocation type support
When building kernel modules with LLVM kCFI, ld.lld
generates kernel modules with R_X86_64_REX_GOTPCRELX
relocation entries. From the latest version of the ELF ABI spec, these relocation entries can be calculated with this formula: G + GOT + A - P
.