gcc/
	PR middle-end/52372
	* rtl.h (pc_rtx, ret_rtx, simple_return_rtx, cc0_rtx): Redefine as
	variables.
	(GR_PC, GR_CC0, GR_RETURN, GR_SIMPLE_RETURN): Delete.
	* emit-rtl.c (pc_rtx, ret_rtx, simple_return_rtx, cc0_rtx): New
	variables.
	(init_emit_regs): Move associated initialization to...
	(init_emit_once): ...here.

From-SVN: r185013