Ahmed Bougacha 97876fa894 [MemCpyOpt] Do move the memset, but look at its dest's dependencies. ...

In effect a partial revert of r237858, which was a dumb shortcut.
Looking at the dependencies of the destination should be the proper
fix: if the new memset would depend on anything other than itself,
the transformation isn't correct.

llvm-svn: 237874

2015-05-21 01:43:39 +00:00

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