[PATCH] Teach Clang how to use response files when calling other tools

[Rafael Auler]

I addressed Sean's comments regarding my last patch update:

- Job.cpp: Removed the quadratic time complexity from buildArgv (for file lists)
- Job.cpp: Removed/Refactored duplicated code
- Job.cpp/Tools.h: Implemented other minor changes
- Tools.h: Refactored/Created a superclass for all GNU tools that have the same behaviour when it comes to response files, avoiding repetitive member function implementations across many classes.

http://reviews.llvm.org/D4897

Files:
  include/clang/Driver/Compilation.h
  include/clang/Driver/Job.h
  include/clang/Driver/Tool.h
  lib/Driver/Compilation.cpp
  lib/Driver/Job.cpp
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  test/Driver/response-file.c
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