RFR: Explicitely convert const oopDesc* to oop in typeArrayOop barriers

[Aleksey Shipilev]

On 02/17/2018 11:13 AM, Roman Kennke wrote:
> My last patch to typeArrayOop.hpp introduced a build failure in release
> builds. It requires an explicit conversion from const oopDesc* to oop to
> pass into the write-barrier.
> 
> http://cr.openjdk.java.net/~rkennke/conv-oop/webrev.00/
> 
> Ok?

OK

-Aleksey