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4e8a4638e9
code. While this didn't have the miscompile (it used MatchLeft consistently) it missed some cases where it could use right shifts. I've added a test case Craig Topper came up with to exercise the right shift matching. This code is really identical between the two. I'm going to merge them next so that we don't keep two copies of all of this logic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229655 91177308-0d34-0410-b5e6-96231b3b80d8
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