InstructionSimplify: One getShuffleMask() replacing multiple getMaskValue(). NFC.

Summary: This is a preparatory step for D32338.

Reviewers: RKSimon, spatel

Reviewed By: RKSimon, spatel

Subscribers: spatel, llvm-commits

Differential Revision: https://reviews.llvm.org/D32388

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301765 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed