[GCC-XML]__int64 support for mscv6

[Brad King]

Hi Jody,

> Since __int64 is defined to be 'long long' by gccxml, all occurrences of
> __int64 are replaces with 'long long'.  This generated xml is incorrect
> since when WIN32 is defined Int64 should be __int64 and UInt64 should be
> unsigned __int64.
[snip]
> Can this problem be fixed by removing __int64 from GCCXML_FLAGS?

No, because the reason __int64 is specified is because GCC's parser does
not understand __int64, but it does understand long long.  The real
solution is probably to modify the XML dump to translate "long long" to
__int64 automatically.  I've added this to the list of items for
implementation in the next version.

As a hack, for now you can just modify whatever you use to read/parse the
XML to translate a FundamentalType of "long long" into "__int64" if
running on windows.

-Brad