[PATCH] Add parsing support for discriminators and indirect call samples.

[Diego Novillo]

  New patch with review suggestions.

Hi chandlerc,

http://llvm-reviews.chandlerc.com/D2355

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2355?vs=5966&id=6373#toc

Files:
  lib/Transforms/Scalar/SampleProfile.cpp
  test/Transforms/SampleProfile/Inputs/bad_sample_line.prof
  test/Transforms/SampleProfile/Inputs/calls.prof
  test/Transforms/SampleProfile/calls.ll
  test/Transforms/SampleProfile/syntax.ll
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