pa.md (smin, [...]): New patterns.

	* pa.md (smin, umin, smax, umax): New patterns.

	* pa.md (cbranch define_delay): Enable nullification of
	conditional branch delay slots (based upon branch direction).
	(conditional branch patterns): Call output_cbranch to get the
	correct output template.  Long conditional branches with an
	annulled delay slot have a length of 3.
	(branch on bit patterns): Call output_bb to get the correct
	output template.  Long branches with an annulled delay slot have
	a length of 3.
	(decrement and branch pattern): Handle nullification of long

From-SVN: r3906