[llvm] [X86] Support EVEX compression from MOVBErr to BSWAP (PR #79775)

[Shengchen Kan via llvm-commits]

KanRobert wrote:

@RKSimon I think he addressed you comment incompletely.
```
  if (IsND)
    MI.tieOperands(0, 1);
```
He forgot to check MOVBE for this.

https://github.com/llvm/llvm-project/pull/79775