[X86] Simplify lowerVectorShuffleAsBitMask to handle only integer VT's

Summary: This function is only called with integer VT arguments, so remove code that handles FP vectors.

Reviewers: RKSimon, craig.topper, delena, andreadb

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D26985

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287743 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed