Teresa Johnson 32d95742b8 Recommit "r306541 - Add zero-length check to memcpy/memset load store loop expansion"" ...

With fix for use-after-free errors. We can't add the new branch and
remove the old one until we are done with the Builder constructed for
the block.

llvm-svn: 306937

2017-07-01 03:24:10 +00:00

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