Many operations do not pass refs to Write. Similarly adding

...interface{} requires constructing a slice, which is slow.

This cuts about 100ns from RRect and Border benchmark.

Signed-off-by: Egon Elbre <egonelbre@gmail.com>

io/profile/profile.go

@@ -24,7 +24,7 @@ type Event struct {
 }
 
 func (p Op) Add(o *op.Ops) {
-	data := o.Write(opconst.TypeProfileLen, p.Tag)
+	data := o.Write1(opconst.TypeProfileLen, p.Tag)
 	data[0] = byte(opconst.TypeProfile)
 }