* sparc.c: Include ggc.h.
	(sparc_add_gc_roots): New function.
	(mark_ultrasparc_pipeline_state): Likewise.
	(override_options): Call sparc_add_gc_roots.
	* pa.c: Include ggc.h.
	(pa_add_gc_roots): New function.
	(mark_deferred_plabels): Likewise.
	(override_options): Call pa_add_gc_roots.
	* mips.c: Include ggc.h.
	(mips_add_gc_roots): New function.
	(override_options): Use it.

From-SVN: r29176