[llvm] [msan] Add Instrumentation for Avx512 Instructions: pmaddw, pmaddubs (PR #153919)

[Thurston Dang via llvm-commits]

thurstond wrote:

This is the successor pull request to https://github.com/llvm/llvm-project/pull/153336 (I had force-pushed the branch while the pull request is closed, and it turns out that kills the pull request forever).

https://github.com/llvm/llvm-project/pull/153919