[PATCH] When canonicalizing gep indices, prefer zext when possible

[hfinkel at anl.gov]

LGTM.


================
Comment at: lib/Transforms/InstCombine/InstCombineCasts.cpp:1076
@@ -1067,1 +1075,3 @@
+
+
   // Attempt to extend the entire input expression tree to the destination
----------------
No need for two blank lines here.

http://reviews.llvm.org/D7255

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