c++: ICE with template NEW_EXPR [PR105803]

c++: ICE with template NEW_EXPR [PR105803]

Here we ICE because value_dependent_expression_p gets a NEW_EXPR
whose operand is a type, and we go to the default case which just
calls v_d_e_p on each operand of the NEW_EXPR.  Since one of them
is a type, we crash on the new assert in t_d_e_p.

t_d_e_p has code to handle {,VEC_}NEW_EXPR, which at this point
was already performed, so I think we can handle these two codes
specifically and skip the second operand, which is always going
to be a type.

	PR c++/105803

gcc/cp/ChangeLog:

	* pt.cc (value_dependent_expression_p): Handle {,VEC_}NEW_EXPR
	in the switch.

gcc/testsuite/ChangeLog:

	* g++.dg/template/new13.C: New test.