[PATCH] D49303: [CodeGen][ObjC] Treat non-escaping blocks as global blocks to make copy/dispose a no-op

[Akira Hatanaka via Phabricator via cfe-commits]

ahatanak created this revision.
ahatanak added a reviewer: rjmccall.
Herald added a subscriber: dexonsmith.

Copying or disposing of a non-escaping block can be a no-op. A non-escaping block on the stack doesn't have to be copied to the heap as we know it won't be called after its lifetime ends.

rdar://problem/39352313


Repository:
  rC Clang

https://reviews.llvm.org/D49303

Files:
  docs/Block-ABI-Apple.rst
  lib/CodeGen/CGBlocks.cpp
  lib/CodeGen/CGBlocks.h
  test/CodeGenObjC/noescape.m

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