re PR c++/7112 (Regression: ICE on C++ code involving templates and sizeof)

re PR c++/7112 (Regression: ICE on C++ code involving templates and sizeof)

	PR c++/7112
	* g++.dg/template/sizeof2.C: New test.

	PR c++/7112
	* mangle.c (write_expression): Add mangling for sizeof when
	applied to a type.
	* operators.def: Remove stale comment.

	* cp-demangle.c (demangle_operator_name): Add type_arg parameter.
	Set it for the "st" operator.
	(demangle_expression): Handle expressions with types as arguments.

From-SVN: r55169