[PATCH] Allow isDereferencablePointer to look through BitCast ConstantExprs

[hfinkel at anl.gov]

> I could have both sides of the if use the same code - but it would have to be the one for the ConstantExpr side.  Is that better?


Yes, I think that would be better. Do that, and LGTM.


http://reviews.llvm.org/D7411

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