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98d5c3141e
and add a doxygen comment. Cache the phi entry to avoid doing tons of PHINode::getBasicBlockIndex calls in the common case. On my insane testcase from re2c, this speeds up CGP from 617.4s to 7.9s (78x). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96083 91177308-0d34-0410-b5e6-96231b3b80d8
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