[PATCH] Propagation of profile samples through the CFG.

[Diego Novillo]

  New documentation for findEquivalencesFor(). Other tweaks from review.

Hi chandlerc, echristo,

http://llvm-reviews.chandlerc.com/D2274

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2274?vs=6414&id=6416#toc

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