David Majnemer 474512576e [MergedLoadStoreMotion] Don't transform across may-throw calls ...

It is unsafe to hoist a load before a function call which may throw, the
throw might prevent a pointer dereference.

Likewise, it is unsafe to sink a store after a call which may throw.
The caller might be able to observe the difference.

This fixes PR27858.

llvm-svn: 270828

2016-05-26 07:11:09 +00:00

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