[PATCH] Use auto profiler to set branch weights

[Diego Novillo]

  1- Renamed the pass and files to use sample profile instead of auto profile.
  2- Adjusted everything that depended on the name (including files and flags).

Hi chandlerc,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2058?vs=5257&id=5265#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/basic.ll
  test/Transforms/SampleProfile/basic.prof
  test/Transforms/SampleProfile/branch.ll
  test/Transforms/SampleProfile/branch.prof
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