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11150876b9
When eliminating a pair of `llvm.objc.autoreleaseReturnValue` followed by `llvm.objc.retainAutoreleasedReturnValue` we need to make sure that the instructions in between are safe to ignore. Other than bitcasts and useless GEPs, it's also safe to ignore lifetime markers for both static allocas (lifetime.start/lifetime.end) and dynamic allocas (stacksave/stackrestore). These get added by the inliner as part of the return sequence and can prevent the transformation from happening in practice. Differential Revision: https://reviews.llvm.org/D69833