InstSimplify:  A shuffle of a splat is always the splat itself

Summary:
Fold:
 shuffle (splat-shuffle), undef, M --> splat-shuffle

Reviewers: spatel, RKSimon, craig.topper

Reviewed By: RKSimon

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D31527

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299990 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed