re PR c++/19030 (ice on tree check)

re PR c++/19030 (ice on tree check)

cp:
	PR c++/19030
	* cp-tree.h (start_decl): Take pointer to pushed scope, not bool.
	* name-lookup.h (push_scope): Return pushed scope, not flag.
	* name-lookup.c (push_scope): Return scope that should be popped,
	not a flag.
	* decl.c (start_decl): Adjust.
	(grokfndecl): Adjust scope push and pop.
	* decl2.c (check_classfn): Likewise.
	* parser.c (cp_parser_condition, cp_parser_conversion_function_id,
	cp_parser_init_declarator, cp_parser_direct_declarator,
	cp_parser_class_specifier, cp_parser_class_head,
	cp_parser_lookup_name,
	cp_parser_constructor_declarator_p): Likewise.
	* pt.c (instantiate_class_template,
	resolve_typename_type): Likewise.
testsuite:
	PR c++/19030
	* g++.dg/parse/crash22.C: New

From-SVN: r92946