RFR(L): 8242088: Replace mutually exclusive lists with concurrent alternatives

[Erik Gahlin]

Looks good.

Erik

> On 1 Jun 2020, at 18:08, Markus Gronlund <markus.gronlund at oracle.com> wrote:
> 
> Greetings,
> 
> Please review the following enhancement:
> 
> Enh / bug: https://bugs.openjdk.java.net/browse/JDK-8242088 
> Webrev: http://cr.openjdk.java.net/~mgronlun/8242088/webrev/ 
> Testing: jdk_jfr, stress tests
> 
> Much of this change set provides a foundation for https://bugs.openjdk.java.net/browse/JDK-8233705, about to be sent separately.
> 
> Thank you
> Markus