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5c: format assembly constant right shift encoding 0 as >>32

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

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

@@ -138,8 +138,12 @@

 		op = "<<>>->@>" + (((v>>5) & 3) << 1);

 		if(v & (1<<4))

 			snprint(str, sizeof str, "R%d%c%cR%d", v&15, op[0], op[1], (v>>8)&15);

-		else

-			snprint(str, sizeof str, "R%d%c%c%d", v&15, op[0], op[1], (v>>7)&31);

+		else {

+			int sh = (v>>7)&31;

+			if(sh == 0 && (v & (3<<5)) != 0)

+				sh = 32;

+			snprint(str, sizeof str, "R%d%c%c%d", v&15, op[0], op[1], sh);

+		}

 		if(a->reg != NREG)

 			snprint(str+strlen(str), sizeof(str)-strlen(str), "(R%d)", a->reg);

 		break;