Fix for PR java/7912:
	* expr.c (can_widen_reference_to): Allow cast of array to
	Cloneable or Serializable.
	* java-tree.h (java_lang_cloneable_identifier_node): Declare.
	(java_io_serializable_identifier_node): Likewise.
	* parse.y (java_lang_cloneable, java_io_serializable): Removed.
	(valid_ref_assignconv_cast_p): Use new identifier nodes.
	* lex.c (java_init_lex): Don't initialize java_lang_cloneable and
	java_io_serializable.
	* decl.c (java_init_decl_processing): Initialize
	java_lang_cloneable_identifier_node and
	java_io_serializable_identifier_node.
	(java_lang_cloneable_identifier_node): New global.
	(java_io_serializable_identifier_node): Likewise.

From-SVN: r59227