[SLPVectorizer] Tidyup isShuffle helper
Ensure we keep track of the input vectors in all cases instead of just for SK_Select.
Ideally we'd reuse the shuffle mask pattern matching in TargetTransformInfo::getInstructionThroughput here to easily add support for all TargetTransformInfo::ShuffleKind without mass code duplication, I've added a TODO for now but D48236 should help us here.
Differential Revision: https://reviews.llvm.org/D48023
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334958 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed