* cpphash.c (collect_objlike_expansion): Add sanity check.
	(special_symbol): Remove case T_CONST, T_XCONST, T_MCONST.  If
	the buffer is the empty string, return.  Mark __DATE__ and
	__TIME__ as XCONST nodes, not MCONST.
	(_cpp_macroexpand): Avoid pushing an empty buffer.
	(funlike_macroexpand): Don't pop token_buffer here.

From-SVN: r33360