* config/xtensa/xtensa-protos.h (xtensa_copy_incoming_a7): Update.
	(init_cumulative_args): Likewise.
	(a7_overlap_mentioned_p): Delete prototype.
	* config/xtensa/xtensa.c (struct machine_function): Replace
	incoming_a7_copied field with need_a7_copy and vararg_a7 flags.
	Add set_frame_ptr_insn field.
	(xtensa_emit_move_sequence): Update call to xtensa_copy_incoming_a7.
	(xtensa_copy_incoming_a7): Rewrite to check need_a7_copy flag and check
	if the operand is an argument in a7.  If so, copy a7 to a new pseudo
	at the function entry and replace the operand with the pseudo.
	(init_cumulative_args): Remove unused arguments.  Add new "incoming"
	argument and record this flag in CUMULATIVE_ARGS.
	(function_arg): Remove result_mode and special-case code to handle
	arguments in a7.  Instead, set need_a7_copy flag when there is an
	incoming argument in a7.
	(xtensa_expand_prologue): Remove code to search for set_frame_ptr insn
	and use the value recorded in cfun->machine->set_frame_ptr_insn.
	(xtensa_builtin_saveregs): Check for negative gp_left value.  Set
	need_a7_copy and vararg_a7 flags.  Use move_block_from_reg instead of
	special-case code.
	(a7_overlap_mentioned_p): Delete.
	* config/xtensa/xtensa.h (CUMULATIVE_ARGS): Add "incoming" flag.
	(INIT_CUMULATIVE_ARGS, INIT_CUMULATIVE_INCOMING_ARGS): Remove useless
	arguments to init_cumulative_args and pass "incoming" flag instead.
	(BLOCK_REG_PADDING): Delete.
	* config/xtensa/xtensa.md (movdi, movsf, movdf): Remove unnecessary
	checks for reload_in_progress and reload_completed.  Update calls to
	xtensa_copy_incoming_a7.
	(ashlsi3): Rename existing insn to ashlsi3_internal.  Add expander
	to call xtensa_copy_incoming_a7.

From-SVN: r77583