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Author SHA1 Message Date
Michael Gottesman 214ca90f8e [objc-arc] Apply the RV optimization to retains next to calls in ObjCARCContract instead of ObjCARCOpts. 
Turning retains into retainRV calls disrupts the data flow analysis in
ObjCARCOpts. Thus we move it as late as we can by moving it into
ObjCARCContract.

We leave in the conversion from retainRV -> retain in ObjCARCOpt since
it enables the dataflow analysis.

rdar://10813093

llvm-svn: 180698
 2013-04-29 06:53:53 +00:00
John McCall d935e9c359 The ARC language-specific optimizer. Credit to Dan Gohman. 
llvm-svn: 133108
 2011-06-15 23:37:01 +00:00