[Patch] First bits of char16_t, char32_t support

[PAOLO.CARLINI@ORACLE.COM]

Hi,

some apparently rather straightforward bits. If I understand correctly the work in the C++ front-end, we don't really need any new special macros, we can just rely on -std=c++0x (__GXX_EXPERIMENTAL_CXX0X__ that is), and, as far as the underlying types are concerned, we know for sure they are short unsigned int and unsigned int (that makes testing very easy). I'm going to wait a bit before committing, anyway... Tested x86_64-linux.

Paolo.

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