RFR: 8237543: Shenandoah: More asserts around code roots

[Zhengyu Gu]

Okay, looks good to me.

-Zhengyu

On 1/20/20 10:20 AM, Roman Kennke wrote:
> We are still observing occasional corrupted code roots in Traversal GC.
> The assert always happens in code roots, and always at init-traversal.
> There are two ways this seems likely to happen: either when new code is
> generated, or during the previous GC cycle. We should plant some
> verifications there to ensure we fail earlier.
> 
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8237543
> Webrev:
> http://cr.openjdk.java.net/~rkennke/JDK-8237543/webrev/
> 
> Testing: hotspot_gc_shenandoah (fastdebug+release) ok
> 
> Can I please get a review?
> 
> Thanks,
> Roman
>