re PR c++/30293 (ICE with extern "Java" in store_init_value)

re PR c++/30293 (ICE with extern "Java" in store_init_value)

	PR c++/30293
	PR c++/30294
	* decl.c (cp_finish_decl): Disallow variable or field
	definitions if extern "Java" aggregates.
	(grokparms): Disallow parameters with extern "Java"
	aggregates.
	(check_function_type): Disallow function return values
	with extern "Java" aggregates.
	* init.c (build_new_1): Disallow placement new with
	extern "Java" aggregates.

	* g++.dg/ext/java-2.C: New test.

From-SVN: r130382