[PATCH] clang-modernize: Introduce process-based parallelism

[Edwin Vane]

Hi Sarcasm, klimek, tareqsiraj, arielbernal,

NOTE: This patch is in progress and is provided only to provide context for
D1877.

This patch introduces a new argument '-j' for transforming sources in
parallel. It defaults to 1. If there are >1 transforms to apply or >1
sources to transform clang-modernize will spawn sub-processes to
transform them.

FIXME: -perf and -summary don't work with this mode of operation as the
sub-processes don't communicate information back to the driver process
yet.

Added tests.

http://llvm-reviews.chandlerc.com/D1950

Files:
  clang-modernize/AddOverride/AddOverride.cpp
  clang-modernize/AddOverride/AddOverride.h
  clang-modernize/Core/CMakeLists.txt
  clang-modernize/Core/IncludeExcludeInfo.cpp
  clang-modernize/Core/JobDispatcher.cpp
  clang-modernize/Core/JobDispatcher.h
  clang-modernize/Core/ReplacementHandling.h
  clang-modernize/Core/Transforms.h
  clang-modernize/LoopConvert/LoopConvert.cpp
  clang-modernize/LoopConvert/LoopConvert.h
  clang-modernize/PassByValue/PassByValue.cpp
  clang-modernize/PassByValue/PassByValue.h
  clang-modernize/ReplaceAutoPtr/ReplaceAutoPtr.cpp
  clang-modernize/ReplaceAutoPtr/ReplaceAutoPtr.h
  clang-modernize/UseAuto/UseAuto.cpp
  clang-modernize/UseAuto/UseAuto.h
  clang-modernize/UseNullptr/UseNullptr.cpp
  clang-modernize/UseNullptr/UseNullptr.h
  clang-modernize/tool/CMakeLists.txt
  clang-modernize/tool/ClangModernize.cpp
  test/clang-modernize/Driver/Inputs/case1/compile_commands.json
  test/clang-modernize/Driver/Inputs/case1/file1.cpp
  test/clang-modernize/Driver/Inputs/case1/file2.cpp
  test/clang-modernize/Driver/Inputs/case2/compile_commands.json
  test/clang-modernize/Driver/Inputs/case2/file1.cpp
  test/clang-modernize/Driver/Inputs/case2/file2.cpp
  test/clang-modernize/Driver/Inputs/case3/compile_commands.json
  test/clang-modernize/Driver/Inputs/case3/file1.cpp
  test/clang-modernize/Driver/Inputs/case3/file2.cpp
  test/clang-modernize/Driver/case1.cpp
  test/clang-modernize/Driver/case2.cpp
  test/clang-modernize/Driver/case3.cpp
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