c++: Remove redundant calls to type_dependent_expression_p

c++: Remove redundant calls to type_dependent_expression_p

This simplifies conditions that test both value_dependent_expression_p and
type_dependent_expression_p, since the former predicate now subsumes the latter.

gcc/cp/ChangeLog:

	* decl.c (compute_array_index_type_loc): Remove redundant
	type_dependent_expression_p check that is subsumed by
	value_dependent_expression_p.
	* decl2.c (is_late_template_attribute): Likewise.
	* pt.c (uses_template_parms): Likewise.
	(dependent_template_arg_p): Likewise.