2016-06-16  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	* target.def (compute_frame_layout): New optional target hook.
	* doc/tm.texi.in (TARGET_COMPUTE_FRAME_LAYOUT): Add hook.
	* doc/tm.texi (TARGET_COMPUTE_FRAME_LAYOUT): Add documentation.
	* lra-eliminations.c (update_reg_eliminate): Call compute_frame_layout
	target hook.
	* reload1.c (verify_initial_elim_offsets): Likewise.
	* config/arm/arm.c (TARGET_COMPUTE_FRAME_LAYOUT): Define.
	(use_simple_return_p): Call arm_compute_frame_layout if needed.
	(arm_get_frame_offsets): Split up into this ...
	(arm_compute_frame_layout): ... and this function.