[PATCH] [InstCombine] Don't fold a GEP into itself through a PHI node

[Nick Lewycky]

Daniel Jasper wrote:
> Ping?

     if (!Op2 || Op1->getNumOperands() != Op2->getNumOperands())
       return nullptr;
​
+   // As for Op1 above, don't try to fold a GEP into itself.
+   if (Op2 == &GEP)
+     return nullptr;

Consider folding that into the check above.

LGTM

> http://reviews.llvm.org/D8245
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