RFR: 8242316: Shenandoah: Turn NULL-check into assert in SATB slow-path entry

[Zhengyu Gu]

Sure.

-Zhengyu

On 4/7/20 4:41 PM, Roman Kennke wrote:
> In ShenandoahRuntime, we do an explicit NULL-check with return, that has
> otherwise only an assert(false). We can turn that into a simple assert.
> 
> We might have left the check there as a safety-net, but it never
> triggered anywhere. Also, we better make sure we never send NULL to the
> SATB-slowpath to begin with.
> 
> Issue:
> https://bugs.openjdk.java.net/browse/JDK-8242316
> Webrev:
> http://cr.openjdk.java.net/~rkennke/JDK-8242316/webrev.00/
> 
> Testing: hotspot_gc_shenandoah
> 
> Ok?
> 
> Roman
>