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* Add an option to disable tail-call optimization for escaping blocks.Akira Hatanaka2018-03-021-0/+54
This makes it easier to debug crashes and hangs in block functions since users can easily find out where the block is called from. The option doesn't disable tail-calls from non-escaping blocks since non-escaping blocks are not as hard to debug as escaping blocks. rdar://problem/35758207 Differential Revision: https://reviews.llvm.org/D43841 llvm-svn: 326530
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