[llvm] [VectorCombine][X86] Use updated getVectorInstrCost hook (PR #137823)

[Luke Lau via llvm-commits]

lukel97 wrote:

> Hey. This seems to have broken MSAN for us (caused false positive). I am not clear yet whether this is a problem with this patch per se, or MSAN. Would you be opposed to reverting this while we figure out what's wrong? Sorry for the bother.

I think a few patches have landed on top of this which might make a revert tricky unfortunately. Is there a buildbot failure or reproducer to try out?

https://github.com/llvm/llvm-project/pull/137823