regclass.c (init_reg_modes): Make non-static.

	* regclass.c (init_reg_modes):  Make non-static.
	Rename to init_reg_modes_once per new naming convention.
	(init_regs):  Don't call init_reg_modes here.
	* emit-rtl.c (init_emit_once):  Call init_reg_modes_once here instead.
	* rtl.h (init_reg_modes_once):  New declaration.
	* toplev.c (backend_init):  Call init_regs after init_emit_once.

From-SVN: r70426