* gdb.mi/gdb2549.exp (register_tests): Expect any decimal for
	the register number instead of expecting only 0.
	* gdb.base/dump.exp: Remove arch-specific tests and do a
	generic data address check to set is64bitonly correctly.
	* rs6000-tdep.c	(rs6000_stab_reg_to_regnum): Return the real
	register number instead of the pseudo register one.
	(rs6000_dwarf2_reg_to_regnum): Likewise.