[PATCH] Partially revert r210444 due to performance regression

[Mark Heffernan]

LGTM.

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Comment at: test/Transforms/SeparateConstOffsetFromGEP/NVPTX/split-gep-and-gvn.ll:59
@@ -58,2 +58,3 @@
 
+
 ; @sum_of_array2 is very similar to @sum_of_array. The only difference is in
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spurious newline.

http://reviews.llvm.org/D4542