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

[Rafael Auler]

Conforming with my last update on D4896, change the encodings to be exclusive for Windows platforms, making it clear that we always use UTF8 on Unix systems. Convert ResponseFile from const char * to StringRef.

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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