[PATCH] Support using sample profiles with partial debug info.

[Diego Novillo]

- Re-factor DISubprogram locator code.
- Remove unecessary test.

http://reviews.llvm.org/D5887

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