gengtype: parse base classes for some GTY-marked types

gengtype: parse base classes for some GTY-marked types

2013-10-23  David Malcolm  <dmalcolm@redhat.com>

	* gengtype-parse.c (require_without_advance): New.
	(type): For GTY-marked types that are not GTY((user)), parse any
	base classes, requiring them to be single-inheritance, and not
	be templates.  For non-GTY-marked types and GTY((user)),
	continue to skip over any C++ inheritance specification.
	* gengtype-state.c (state_writer::write_state_struct_type):
	Write base class of type (if any).
	(read_state_struct_type): Read base class of type (if any).
	* gengtype.c (new_structure): Add a "base_class" parameter.
	(create_optional_field_): Update for new parameter to
	new_structure.
	(adjust_field_rtx_def): Likewise.
	(adjust_field_tree_exp): Likewise.
	* gengtype.h (struct type): Add "base_class" field to the s
	union field.
	(new_structure): Add "base" parameter.

From-SVN: r204003