"git@repo.hca.bsc.es:rferrer/llvm-epi-0.8.git" did not exist on "38e05a9eb2cc6464359813cae848b8167d30efcc"
Add preparePassManager() hook. This allows each pass to check whether
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. llvm-svn: 34941
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