[14] RFR 8241984: Shenandoah: enhance GCTimer and JFR support

[Zhengyu Gu]

Looks good.

-Zhengyu

On 5/18/20 1:12 PM, Aleksey Shipilev wrote:
> Original RFE:
>    https://bugs.openjdk.java.net/browse/JDK-8241984
>    https://hg.openjdk.java.net/jdk/jdk/rev/13e20575efe1
> 
> There are were some conflicts during the application, so I had to reapply some hunks myself. Also,
> there is no GCTraceTimeWrapper in 14u, only GCTraceTimeImplWrapper.
> 
> 14u webrev:
>    https://cr.openjdk.java.net/~shade/8241984/webrev.14u.01/
> 
> Testing: hotspot_gc_shenandoah {fastdebug,release}
>