[llvm-branch-commits] [msan] Implement shadow propagation for _mm_dp_pd, _mm_dp_ps, _mm256_dp_ps (PR #94875)

[Vitaly Buka via llvm-branch-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/94875

Default intrinsic handling was to report any
uninitialized part of argument. However intrinsics
use mask which allow to ignore parts of input, so
it's OK to have vectors partially initialized.