[X86] Avoid generating invalid R_X86_64_GOTPCRELX relocations

We need to make sure not to emit R_X86_64_GOTPCRELX relocations for
instructions that use a REX prefix. If a REX prefix is present, we need to
instead use a R_X86_64_REX_GOTPCRELX relocation. The existing logic for
CALL64m, JMP64m, etc. already handles this by checking the HasREX parameter
and using it to determine which relocation type to use. Do this for all
instructions that can use relaxed relocations.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D93561