RFR: 8257020: [JVMCI] enable a JVMCICompiler to specify which GCs it supports [v4]

[Doug Simon]

On Fri, 27 Nov 2020 19:00:56 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Doug Simon has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains seven additional commits since the last revision:
>> 
>>  - Merge remote-tracking branch 'openjdk-jdk/master' into JDK-8257020
>>  - implemented isGCSupported in Graal compiler
>>  - removed JVMCI logic from GCConfig and introduced WhiteBox.isGCSupportedByJVMCI instead
>>  - removed broken check_jvmci_supported_gc logic
>>  - removed redundant signature
>>  - move logic to GCConfig
>>  - enable a JVMCICompiler to specify which GCs it supports
>
> Looks good.

Thanks for the review @vnkozlov .
Are you also good with the PR is its current state @stefank ?

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