[PATCH] Add Load Combine Pass

[Michael Spencer]

Moved out to separate pass run after SLP vectorizer. Still need to do a test-suite run.

This combines some loads that probably shouldn't be combined. I believe the proper fix here is to split (trunc (shr (load ...), <multiple of 8>), n) in SDAG for targets where the hardware will do load combining. This still exposes the optimization opportunity without regressing anything.

http://reviews.llvm.org/D3580

Files:
  include/llvm/InitializePasses.h
  include/llvm/Transforms/Scalar.h
  lib/Transforms/IPO/PassManagerBuilder.cpp
  lib/Transforms/Scalar/CMakeLists.txt
  lib/Transforms/Scalar/LoadCombine.cpp
  lib/Transforms/Scalar/Scalar.cpp
  test/Transforms/LoadCombine/load-combine.ll
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