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

[Reid Kleckner]

Hi rsmith,

Currently -fms-extensions controls this behavior, which doesn't make
much sense. It means we can't identify what is and isn't a system header
when compiling our own preprocessed output, because #line doesn't
represent this information.

If someone is feeding Clang's preprocessed output to another compiler,
they can use this flag.

Fixes PR20553.

http://reviews.llvm.org/D5217

Files:
  include/clang/Driver/Options.td
  include/clang/Frontend/PreprocessorOutputOptions.h
  lib/Frontend/CompilerInvocation.cpp
  lib/Frontend/PrintPreprocessedOutput.cpp
  lib/Frontend/Rewrite/InclusionRewriter.cpp
  test/Frontend/rewrite-includes-line-markers.c
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