Improve specs processing to allow %* in function arguments

Improve specs processing to allow %* in function arguments

2018-07-31  Olivier Hainque  <hainque@adacore.com>

	* gcc.c (handle_spec_function): Accept a soft_matched_part
	argument, as do_spec_1.  Pass it down to ...
	(eval_spec_function): Accept a soft_matched_part argument,
	and pass it down to ...
	(do_spec_2): Accept a soft_matched_part argument, and pass
	it down to do_spec_1.
	(do_spec_1): Pass soft_matched_part to handle_spec_function.
	(handle_braces): Update call to handle_spec_function.
	(driver::set_up_specs): Update calls to do_spec_2.
	(compare_debug_dump_opt_spec_function): Likewise.
	(compare_debug_self_opt_spec_function): Likewise.

From-SVN: r263087