Serguei Katkov 6ea2e81cf6 [ImplicitNullCheck] Fix the bug when dependent instruction accesses memory ...

It is possible that dependent instruction may access memory.
In this case we must reject optimization because the memory change will
be visible in null handler basic block. So we will execute an instruction which
we must not execute if check fails.

Reviewers: sanjoy, reames
Reviewed By: sanjoy
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D36392

llvm-svn: 310443

2017-08-09 05:17:02 +00:00

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