[PATCH] Fix a performance problem in gep(gep ...) merging

[Wei Mi]

1. updated getelementptr.ll.
2. descale-zero.ll failed with the patch. Actually the testcase didn't go through the code added in the original patch (For the testcase, InstCombiner::Descale was not called), which showed it was an invalid testcase. So I simply removed it.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8911

Files:
  lib/Transforms/InstCombine/InstructionCombining.cpp
  test/Transforms/InstCombine/descale-zero.ll
  test/Transforms/InstCombine/gep-merge.ll
  test/Transforms/InstCombine/getelementptr.ll

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