2017-05-14  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	* config/i386/i386.c (ix86_can_use_return_insn_p): Use the ix86_frame
	data structure directly.
	(ix86_initial_elimination_offset): Likewise.
	(ix86_expand_prologue): Likewise.
	(ix86_expand_epilogue): Likewise.
	(ix86_expand_split_stack_prologue): Likewise.
	(ix86_compute_frame_layout): Remove frame parameter ...
	(TARGET_COMPUTE_FRAME_LAYOUT): ... and export it as a target hook.
	(ix86_finalize_stack_realign_flags): Call ix86_compute_frame_layout
	only if necessary.
	(ix86_init_machine_status): Don't set use_fast_prologue_epilogue_nregs.
	(ix86_frame): Move from here ...
	* config/i386/i386.h (ix86_frame): ... to here.
	(machine_function): Remove use_fast_prologue_epilogue_nregs, cache the
	complete ix86_frame data structure instead.