coff.h (REGISTER_NAMES): Add fake register `argptr'

coff.h (REGISTER_NAMES): Add fake register `argptr'

	* config/m68k/coff.h (REGISTER_NAMES): Add fake register `argptr'
	* config/m68k/hp320.h (REGISTER_NAMES): Likewise.
	* config/m68k/linux.h (REGISTER_NAMES): Likewise.
	* config/m68k/m68kelf.h (REGISTER_NAMES): Likewise.
	* gcc/config/m68k/sgs.h (REGISTER_NAMES): Likewise.
	* config/m68k/m68k-protos.h (m68k_initial_elimination_offset): Add prototype.
	* config/m68k/m68k.c (m68k_frame): New struct, simular to ix86 back-end.
	(m68k_compute_frame_layout): New function.
	(m68k_initial_elimination_offset): New function.
	(m68k_output_function_prologue): ColdFire-specific movem handling.
	(m68k_output_function_epilogue): Likewise.
	* config/m68k/m68k.h (FIRST_PSEOUDO_REGISTER): Make room for argptr reg.
	(ARG_POINTER_REGNUM): Add new definition.
	(INITIAL_FRAME_POINTER_OFFSET): Remove macro.
	(ELIMINABLE_REGS): Define new macro, like in ix86 back-end.
	(CAN_ELIMINATE): Likewise.
	(INITIAL_ELIMINATION_OFFSET): Likewise.

Co-Authored-By: Peter Barada <peter@baradas.org>
From-SVN: r71231