cc: back out side() change unil 8c is fixed

this change made 8c fail to build libvorbis and gs, until this
is fixed we can live with non-optimal code.

sys/src/cmd/cc/sub.c

@@ -950,8 +950,6 @@ loop:
 	case OOROR:
 	case OCOMMA:
 	case ODOT:
-	case OFAS:
-	case OINDEX:
 		if(side(n->left))
 			break;
 		n = n->right;
@@ -963,10 +961,6 @@ loop:
 	case OSTRING:
 	case OLSTRING:
 	case ONAME:
-	case OREGPAIR:
-	case OEXREG:
-	case OREGISTER:
-	case OINDREG:
 		return 0;
 	}
 	return 1;