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5c: do shift propagation for rotate right (ROR)

--- a/sys/src/cmd/5c/peep.c

+++ b/sys/src/cmd/5c/peep.c

@@ -45,7 +45,7 @@

 	t = 0;

 	for(r=firstr; r!=R; r=r->link) {

 		p = r->prog;

-		if(p->as == ASLL || p->as == ASRL || p->as == ASRA) {

+		if(p->as == ASLL || p->as == ASRL || p->as == ASRA || p->as == AROR) {

 			/*

 			 * elide shift into D_SHIFT operand of subsequent instruction

 			 */

@@ -668,6 +668,9 @@

 		break;

 	case ASRA:

 		o |= 2<<5;

+		break;

+	case AROR:

+		o |= 3<<5;

 		break;

 	}

 	p2->from.offset = o;

-- 

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