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2e2cce69bc
1. Chain to the parent implementation of M/R analysis if we can't find any information. It has some heuristics that often do well. 2. Do not clear all flags, this can make invalid nodes by turning nodes that used to be collapsed into non-collapsed nodes (fixing crashes) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20659 91177308-0d34-0410-b5e6-96231b3b80d8