[llvm] [X86] Rewrite MOVUPD to MOVUPS in X86FixupInstTuning (PR #217676)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon commented:

missing rm/mr test coverage

if you're after regular codegen coverage, -mcpu=atom doesn't care about domains much.

https://github.com/llvm/llvm-project/pull/217676