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00ab8cc01c
a tail call Previosly ARC optimizer removed the autoreleaseRV/retainRV pair in the following code, which caused the object returned by @something to be placed in the autorelease pool because the call to @something isn't a tail call: ``` %call = call i8* @something(...) %2 = call i8* @objc_retainAutoreleasedReturnValue(i8* %call) %3 = call i8* @objc_autoreleaseReturnValue(i8* %2) ret i8* %3 ``` Fix the bug by checking whether @something is a tail call. rdar://problem/59275894