Updates #15462

Replace all use of oconv(op, FmtSharp) with fmt.Printf("%#v", op).
This removes all the callers of oconv.

Change-Id: Ic3bf22495147f8497c8bada01d681428e2405b0e
Reviewed-on: https://go-review.googlesource.com/22530Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>