[llvm] [X86] Fix wrong RIP-relative relocations for AVX10.2 saturation conversions (PR #185254)

[Shengchen Kan via llvm-commits]

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KanRobert wrote:

Do you run
```
llvm-tblgen --print-records ./llvm/lib/Target/X86/X86.td -I./llvm/include/ -I./llvm/lib/Target/X86/
```

to check that the field `ExeDomain` of VCVTBF162IBS keep unchanged? I doubt it's not covered by LIT/UT

https://github.com/llvm/llvm-project/pull/185254