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[X86] VEX/EVEX prefix doesn't work for inline assembly.

Authored by LiuChen3 on Oct 22 2020, 8:32 PM.

Description

[X86] VEX/EVEX prefix doesn't work for inline assembly.

For now, we lost the encoding information if we using inline assembly.
The encoding for the inline assembly will keep default even if we add
the vex/evex prefix.

Differential Revision: https://reviews.llvm.org/D90009