Dan Gohman 2f6263c96a Add a new ObjC ARC optimization pass to eliminate unneeded
autorelease push+pop pairs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148330 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-17 20:52:24 +00:00
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