-fuse-caller-save - Collect register usage information

-fuse-caller-save - Collect register usage information

2014-05-28  Radovan Obradovic  <robradovic@mips.com>
            Tom de Vries  <tom@codesourcery.com>

	* cgraph.h (struct cgraph_rtl_info): Add function_used_regs
	and function_used_regs_valid fields.
	* final.c: Move include of hard-reg-set.h to before rtl.h to declare
	find_all_hard_reg_sets.
	(collect_fn_hard_reg_usage, get_call_fndecl, get_call_cgraph_rtl_info)
	(get_call_reg_set_usage): New function.
	(rest_of_handle_final): Use collect_fn_hard_reg_usage.
	* regs.h (get_call_reg_set_usage): Declare.

Co-Authored-By: Tom de Vries <tom@codesourcery.com>
From-SVN: r211006