Fix gdb testsuite regressions.

	* class.c (build_vtbl_or_vbase_field): New parameter fcontext.
	Store it in DECL_FCONTEXT.
	(build_vbase_pointer_fields, create_vtable_ptr): Fix callers.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@31729 138bc75d-0d04-0410-961f-82ee72b054a4