[PATCH] Use auto profiler to set branch weights

[Diego Novillo]

  Addressed chandlerc's feedback.

Hi chandlerc,

http://llvm-reviews.chandlerc.com/D2058

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2058?vs=5469&id=5482#toc

Files:
  include/llvm/InitializePasses.h
  include/llvm/Transforms/Scalar.h
  lib/Transforms/Scalar/CMakeLists.txt
  lib/Transforms/Scalar/SampleProfile.cpp
  lib/Transforms/Scalar/Scalar.cpp
  test/Transforms/SampleProfile/branch.ll
  test/Transforms/SampleProfile/branch.prof
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