frame-header-opt.c (gate): Check for optimize > 0.

frame-header-opt.c (gate): Check for optimize > 0.

2015-11-24  Steve Ellcey  <sellcey@imgtec.com>

	* frame-header-opt.c (gate): Check for optimize > 0.
	(has_inlined_assembly): New function.
	(needs_frame_header_p): Remove is_leaf_function check,
	add argument type check.
	(callees_functions_use_frame_header): Add is_leaf_function
	and has_inlined_assembly calls..
	(set_callers_may_not_allocate_frame): New function.
	(frame_header_opt): Add is_leaf_function call, add
	set_callers_may_not_allocate_frame call.
	* config/mips/mips.c (mips_compute_frame_info): Add check
	to see if callee saved regs can be put in frame header.
	(mips_expand_prologue): Add check to see if step1 is zero,
	fix cfa restores when using frame header to store regs.
	(mips_can_use_return_insn): Check to see if registers are
	stored in frame header.
	* config/mips/mips.h (machine_function): Add
	callers_may_not_allocate_frame and
	use_frame_header_for_callee_saved_regs fields.

From-SVN: r230845