gen-pass-instances.awk: Rewritten.

gen-pass-instances.awk: Rewritten.

	* gen-pass-instances.awk: Rewritten.
	* Makefile.in (pass-instances.def): Depend on $(PASSES_EXTRA), pass
	$(PASSES_EXTRA) after passes.def to the script.
	* config/i386/t-i386 (PASSES_EXTRA): Add i386-passes.def.
	* config/i386/i386-passes.def: New file.
	* config/i386/i386-protos.h (make_pass_insert_vzeroupper,
	make_pass_stv): Declare.
	* config/i386/i386.c (pass_stv::pass_stv): Initialize timode_p to
	false.
	(pass_stv::gate): Depending on timode_p member require TARGET_64BIT
	or !TARGET_64BIT.
	(pass_stv::clone, pass_stv::set_pass_param): New methods.
	(pass_stv::timode_p): New non-static data member.
	(ix86_option_override): Don't register passes here.

From-SVN: r240887