[PATCH] Use DiagnosticInfo facility.

[Diego Novillo]

Hi chandlerc, qcolombet,

The sample profiler pass emits several error messages. Instead of
just aborting the compiler with report_fatal_error, we can emit
better messages using DiagnosticInfo.

This adds a new sub-class of DiagnosticInfo to handle the sample
profiler.

http://llvm-reviews.chandlerc.com/D3086

Files:
  include/llvm/IR/DiagnosticInfo.h
  lib/IR/DiagnosticInfo.cpp
  lib/Transforms/Scalar/SampleProfile.cpp
  test/Transforms/SampleProfile/syntax.ll
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