[cfe-dev] [patch] Microsoft Extension - #pragma message

[Michael Spencer]

I implemented this rather simple extension to get more familiar with
the code base. It differs from the MSVC implementation because of the
way clang handles diagnostics. MSVC simply prints _exactly_ what's in
the quoted string to the standard output with a new line at the end.
Because this behavior does not fit in well with the way clang handles
diagnostics, I added a new warning that prints out the quoted string.
This should not {a,e}ffect the correctness of any code, but still
provides the intended functionality.

- Michael Spencer
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