[PATCH] Coverage mapping: add generation for the value of HasCodeBefore flag.

[Alex Lorenz]

Hi bogner, bob.wilson, dexonsmith,

This patch implements the generation of the value for the mapping region's HasCodeBefore flag.

http://reviews.llvm.org/D5034

Files:
  lib/CodeGen/CoverageMappingGen.cpp
  test/CoverageMapping/break.c
  test/CoverageMapping/casts.c
  test/CoverageMapping/continue.c
  test/CoverageMapping/header.cpp
  test/CoverageMapping/if.c
  test/CoverageMapping/includehell.cpp
  test/CoverageMapping/label.cpp
  test/CoverageMapping/logical.cpp
  test/CoverageMapping/loopmacro.c
  test/CoverageMapping/loops.cpp
  test/CoverageMapping/macroparams2.c
  test/CoverageMapping/macros.c
  test/CoverageMapping/objc.m
  test/CoverageMapping/preprocessor.c
  test/CoverageMapping/return.c
  test/CoverageMapping/test.c
  test/CoverageMapping/trycatch.cpp
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