[llvm] Reapply "[msan] Add avx512-intrinsics.ll and avx512-intrinsics-upgrade.ll test case (#123980)" (PR #124500)

[Thurston Dang via llvm-commits]

thurstond wrote:

> > Since these are MSan tests, and we want to know how MSan deals with uninitialized memory, undef seems appropriate?
> 
> Undef handling is simpler and have dedicated tests. Here we'd like to see how msan propagate shadow, parameter is actually better.

Fixed in https://github.com/llvm/llvm-project/pull/124500/commits/70668afe100362275034b402094b5e5db1939611, https://github.com/llvm/llvm-project/pull/124500/commits/d0fab8404cde23b57fa44fb84f7f5469dfaf60d9 and https://github.com/llvm/llvm-project/pull/124500/commits/3938a45bc0e2c9491713fbe06bf61205c383b1e9

https://github.com/llvm/llvm-project/pull/124500