[X86] Fix wrong RIP-relative relocations for AVX10.2 saturation conversions (#185254)
AVX10.2 saturation conversion instructions (VCVT{T}{BF16,PH,PS}2I{U}BS)
incorrectly inherited from AVX512{PS,XD,PD}Ii8Base, which sets
ImmT=Imm8. This caused X86MCCodeEmitter to account for a nonexistent
trailing immediate byte when computing RIP-relative displacement fixups,
producing an addend of -5 instead of the correct -4.
Replace AVX512PSIi8Base/AVX512XDIi8Base/AVX512PDIi8Base with just the
needed prefix classes (PS is default, XD, PD), dropping the bogus
ImmT=Imm8. Preserve the original ExeDomain values (SSEPackedSingle,
SSEPackedDouble, SSEPackedInt; verified with `llvm-tblgen
--print-records ./llvm/lib/Target/X86/X86.td -I./llvm/include/
-I./llvm/lib/Target/X86/`). ExeDomain is not covered by any test.
Fix https://github.com/llvm/llvm-project/issues/184251
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