Preparatory work for PR target/21623:

Preparatory work for PR target/21623:

	* alpha.c (secondary_reload_class): Rename to:
	(alpha_secondary_reload_class).
	* alpha.h, alpha-protos.h: Likewise.
	* mn10300.c (secondary_reload_class): Rename to:
	(mn10300_secondary_reload_class).
	* mn10300.h, mn10300-protos.h: Likewise.
	* pa.c (secondary_reload_class): Rename to:
	(pa_secondary_reload_class).
	* pa.h, pa-protos.h: Likewise.
	* rs6000.c (secondary_reload_class): Rename to:
	rs6000_secondary_reload_class.
	* rs6000.h, rs6000-protos.h: Likewise.

From-SVN: r107381