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Commit a72630d4 authored by Michael Gottesman's avatar Michael Gottesman
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[objc-arc] Teach the ARC optimizer that objc_sync_enter/objc_sync_exit do not... 

[objc-arc] Teach the ARC optimizer that objc_sync_enter/objc_sync_exit do not modify the ref count of an objc object and additionally are inert for modref purposes.

llvm-svn: 185769
parent 6d715e86
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