2 Commits

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