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Since we handle optimizable objc_retainBlocks through strength reduction in OptimizableIndividualCalls, we know that all code after that point will only see non-optimizable objc_retainBlock calls. IsForwarding is only called by functions after that point, so it is ok to just classify objc_retainBlock as non-forwarding. <rdar://problem/13249661>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178285 91177308-0d34-0410-b5e6-96231b3b80d8
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