RFR: 8257020: [JVMCI] enable a JVMCICompiler to specify which GCs it supports [v7]

[Doug Simon]

On Thu, 3 Dec 2020 12:05:57 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> Doug Simon has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix @requires vm.jvmci
>
> I've been talking to Doug the last few days and we've settled on this approach that both solves their testing needs, and at the same time satisfy my wish to *not* turn on EnableJVMCI for GCs that don't have fully support for it.

Thanks a lot for the diligent review and helpful contributions @stefank !

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PR: https://git.openjdk.java.net/jdk/pull/1423