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Author SHA1 Message Date
Dan Gohman a7107f992e Teach the ARC optimizer about the !clang.arc.copy_on_escape metadata 
tag on objc_retainBlock calls, which indicates that they may be
optimized away. rdar://10211286.

llvm-svn: 142298
 2011-10-17 22:53:25 +00:00
Dan Gohman 2053a5dd64 Don't eliminate objc_retainBlock calls on stack objects if the 
objc_retainBlock call is potentially responsible for copying
the block to the heap to extend its lifetime. rdar://10209613.

llvm-svn: 140814
 2011-09-29 22:25:23 +00:00