[PATCH] Add another InstCombine pass after LoopUnroll

[Wei Mi]

Hi qcolombet, hfinkel,

This is to cleanup some redundency generated by LoopUnroll pass. Such redundency may not be cleaned up by existing latter passes. 
The problem is described in https://llvm.org/bugs/show_bug.cgi?id=23524. 

I tested spec2000 and internal benchmarks and I saw no performance difference.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9777

Files:
  lib/Transforms/IPO/PassManagerBuilder.cpp
  test/Transforms/LoopUnroll/unroll-cleanup.ll

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