[PATCH] Add -fuse-line-directive flag to control usage of #line with -E

[Reid Kleckner]

- Pluralize the argument everywhere
- Add driver logic. I considered a test, but it's expensive.


http://reviews.llvm.org/D5217

Files:
  include/clang/Driver/Options.td
  include/clang/Frontend/PreprocessorOutputOptions.h
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  lib/Frontend/PrintPreprocessedOutput.cpp
  lib/Frontend/Rewrite/InclusionRewriter.cpp
  test/Frontend/rewrite-includes-line-markers.c
  test/Lexer/pragma-operators.cpp
  test/Preprocessor/_Pragma-location.c

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