class.c (build_vtbl_initializer): Clear the entire vtbl_init_data.

class.c (build_vtbl_initializer): Clear the entire vtbl_init_data.

	* class.c (build_vtbl_initializer): Clear the entire
	vtbl_init_data.  Start keeping track of the functions for which we
	have created vcall offsets here.
	(dfs_build_vcall_offset_vtbl_entries): Remove.
	(build_vcall_offset_vtbl_entries): Reimplement.
	(add_vcall_offset_vtbl_entries_r): New function.
	(add_vcall_offset_vtbl_entries_1): Likewise.  Tweak logic for
	computing when vcall offsets are necessary.

From-SVN: r35828