[PATCH] Add new debug kind LocTrackingOnly.

[Diego Novillo]

Hi echristo, dblaikie,

This new debug emission kind supports emitting line location
information in all instructions, but stops code generation
from emitting debug info to the final output.

This mode is useful when the backend wants to track source
locations during code generation, but it does not want to
produce debug info. This is currently used by optimization
remarks (-Rpass, -Rpass-missed and -Rpass-analysis).

When one of the -Rpass flags is used, the front end will enable
line and column tracking, only if no other debug option is enabled.

Depends on D4234.

http://reviews.llvm.org/D4235

Files:
  include/clang/Basic/DiagnosticFrontendKinds.td
  include/clang/Frontend/CodeGenOptions.def
  include/clang/Frontend/CodeGenOptions.h
  lib/CodeGen/CGDebugInfo.cpp
  lib/CodeGen/CodeGenAction.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/Frontend/optimization-remark.c
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