[lld] [X86][LLD] Handle R_X86_64_CODE_6_GOTTPOFF relocation type (PR #117675)

[Shengchen Kan via llvm-commits]

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KanRobert wrote:

BTW, there is a problem with the newly added relocation optimization. Unlike the relocation w/ REX prefix, we don't check the bits strictly. For example, we don't check if the W, X, pp and zero bits in EVEX payload2.  This brings an potential issue that the linker hides the bug of assembler.

https://github.com/llvm/llvm-project/pull/117675