Bug 23529: Add support for gcc's attribute abi_tag (needed for compatibility with gcc 5's libstdc++)

[Stefan Bühler via cfe-commits]

Hi all,

I've been working on #23529.

The abi tag mangling implemented by gcc is horrible, but I think my
patch covers most of the incompatibilities with gcc5.

There might be some bugs with substitutions, although I have to come up
with a test case for that to see what gcc does...

Test cases comparing gcc and patched clang++:
http://files.stbuehler.de/test-itanium-mangle.html
(generated with http://files.stbuehler.de/test-itanium-mangle.sh, also
attached)

regards,
Stefan
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