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22a1cf9d3a
current active pass manager is appropriate or not. A loop pass may consider current LPPassManager in appropraite if loop pass is not preserving analysis information that is used by other passes managed by current LPPassManager. In such situation, loop pass can pop current LPPassManager from the PMStack using this hook and use new LPPassManager for itself. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34941 91177308-0d34-0410-b5e6-96231b3b80d8
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