[PATCH] Tests for coverage mapping

[Alex Lorenz]

Hi bob.wilson, bogner,

This patch adds the tests for the coverage mapping generation. Most of the tests check
the mapping regions produced by the generator, and one checks the IR.

This patch depends on the updated command line coverage tool.

http://reviews.llvm.org/D4793

Files:
  test/CoverageMapping/break.c
  test/CoverageMapping/builtinmacro.c
  test/CoverageMapping/casts.c
  test/CoverageMapping/class.cpp
  test/CoverageMapping/classtemplate.cpp
  test/CoverageMapping/code.h
  test/CoverageMapping/continue.c
  test/CoverageMapping/derivedclass.cpp
  test/CoverageMapping/header1.h
  test/CoverageMapping/if.c
  test/CoverageMapping/includehell.cpp
  test/CoverageMapping/ir.c
  test/CoverageMapping/label.cpp
  test/CoverageMapping/logical.cpp
  test/CoverageMapping/loopmacro.c
  test/CoverageMapping/loops.cpp
  test/CoverageMapping/macroception.c
  test/CoverageMapping/macrohell.c
  test/CoverageMapping/macroparams.c
  test/CoverageMapping/macroparams2.c
  test/CoverageMapping/macros.c
  test/CoverageMapping/nestedclass.cpp
  test/CoverageMapping/preprocessor.c
  test/CoverageMapping/return.c
  test/CoverageMapping/switch.c
  test/CoverageMapping/templates.cpp
  test/CoverageMapping/test.c
  test/CoverageMapping/trycatch.cpp
  test/CoverageMapping/tu1.cpp
  test/CoverageMapping/tu2.cpp
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