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Summary: An undef extract index can be arbitrarily chosen to be an out-of-range index value, which would result in the instruction being undef. This change closes a gap identified while working on lowering vector permute intrinsics with variable index vectors to pure LLVM IR. Reviewers: arsenm, spatel, majnemer Reviewed By: arsenm, spatel Subscribers: fhahn, nhaehnle, wdng, llvm-commits Differential Revision: https://reviews.llvm.org/D40231 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319910 91177308-0d34-0410-b5e6-96231b3b80d8
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