wp becomes wa with isa p9tf, and wq is replaced by wa with isa p9kf.
To manage to do that, there is the new mode attribute VSisa.


	* config/rs6000/constraints.md (define_register_constraint "wp"):
	Delete.
	(define_register_constraint "wq"): Delete.
	* config/rs6000/rs6000.c (rs6000_debug_reg_global): Adjust.
	(rs6000_init_hard_regno_mode_ok): Adjust.
	* config/rs6000/rs6000.h (enum r6000_reg_class_enum): Delete
	RS6000_CONSTRAINT_wp and RS6000_CONSTRAINT_wq.
	* config/rs6000/vsx.md (define_mode_attr VSr3): Delete.
	(define_mode_attr VSa): Delete.
	(define_mode_attr VSisa): New.
	(rest of file): Adjust.
	* doc/md.texi (Machine Constraints): Adjust.

From-SVN: r271939