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30ae72f02c
new vector shuffle lowering. This is loosely based on a patch by Marius Wachtler to the PR (thanks!). I refactored it a bi to use std::count_if and a mutable array ref but the core idea was exactly right. I also added some direct testing of this case. I believe PR21137 is now the only remaining regression. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219081 91177308-0d34-0410-b5e6-96231b3b80d8
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