[PATCH] Use discriminator information in sample profiles.

[Diego Novillo]

  Replace std::pair with InstructionLocation to represent Line and
  Discriminator pairs.

Hi chandlerc,

http://llvm-reviews.chandlerc.com/D2857

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2857?vs=7282&id=7552#toc

BRANCH
  discriminator-profile

ARCANIST PROJECT
  llvm

Files:
  lib/Transforms/Scalar/SampleProfile.cpp
  test/Transforms/SampleProfile/Inputs/calls.prof
  test/Transforms/SampleProfile/Inputs/discriminator.prof
  test/Transforms/SampleProfile/branch.ll
  test/Transforms/SampleProfile/calls.ll
  test/Transforms/SampleProfile/discriminator.ll
  test/Transforms/SampleProfile/propagate.ll
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