RFR: Disable over-strong assert

[Zhengyu Gu]

Good to me.

-Zhengyu

On 03/31/2017 10:21 AM, Roman Kennke wrote:
> I recently put an assert in maybe_update_heap_oop() which asserts that
> when a Java thread beat us with a store, that the stored value is
> to-space. There's a small gotcha there: if the Java thread beat us with
> an arraycopy, there is a small window where we can see from-space
> values, before the Java thread calls the post-ref-array-barrier.
>
> http://cr.openjdk.java.net/~rkennke/disable-assert/webrev.00/
> <http://cr.openjdk.java.net/%7Erkennke/disable-assert/webrev.00/>
>
> Roman
>
>