[PATCH] Initial support for __sptr and __uptr

[Aaron Ballman]

__sptr and __uptr are pointer type qualifiers that relate to __ptr32
and __ptr64.  Specifically, they specify how pointers are supposed to
be converted (sign extended or zero extended).  For more information,
see MSDN: http://msdn.microsoft.com/en-us/library/aa983399.aspx

This patch brings in parsing support, some semantic warnings and test
cases for code which uses __sptr and __uptr in conjunction with
__ptr32 and __ptr64.  A future patch will have to be made to hook into
the codegen machinery to support __ptr32 and __ptr64 more fully.

This patch is modeled after the existing __ptr32 and __ptr64 support.

~Aaron
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