re PR c++/23099 (ICE in build_simple_base_path, at cp/class.c:460)

re PR c++/23099 (ICE in build_simple_base_path, at cp/class.c:460)

	PR c++/23099
	* cp-tree.h (saved_scope): Add skip_evaluation.
	* decl.c (start_decl): Use DECL_INITIALIZED_IN_CLASS_P, not
	DECL_INITIAL, to determine whether or not a static data member was
	initialized in the class-specifier.
	(cp_finish_decl): Add comment.
	* init.c (integral_constant_value): Subtitute into the
	initializers for static data members in	templates.
	* name-lookup.c (push_to_top_level): Save skip_evaluation.
	(pop_from_top_level): Restore it.
	* pt.c (instantiate_class_template): Do not substitute into the
	intializers of static data members when instantiating a class.
	(regenerate_decl_from_template): Simplify.
	(instantiate_decl): Tidy.  Substitute into the initializer for a
	static data member even when the definition of the data member is
	not available.

	PR c++/23099
	* g++.dg/init/member1.C: Make sure erroneous static data member
	definitions are required.
	* g++.dg/template/static13.C: New test.
	* g++.dg/template/static14.C: Likewise.

From-SVN: r103604