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f970832c3b
This patch causes compile times for some patterns to explode. I have a (large, unreduced) test case that slows down by more than 20x and several test cases slow down by 2x. I'm sending some of the test cases directly to Nirav and following up with more details in the review log, but this should unblock anyone else hitting this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296862 91177308-0d34-0410-b5e6-96231b3b80d8