[PATCH] preprocessor stringizing raw strings

[Nathan Sidwell]

Christophe,
> Didn't you forget to add -save-temps in the testcase?
> I'm seeing it failing because:
> g++.dg/cpp/string-3.C  -std=c++11 : output file does not exist
> UNRESOLVED: g++.dg/cpp/string-3.C  -std=c++11  scan-file BEGIN
> "R\\"(\\n)\\""\n END

Surprisingly we emit a .i file, but I'd also flubbed the regexp with 
insufficient escaping.

Fixed thusly.

nathan

-- 
Nathan Sidwell
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