RFR: 8340576: Some JVMCI flags are inconsistent [v2]

[Doug Simon]

On Wed, 25 Sep 2024 10:32:49 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

>> This PR replaces some uses of `UseJVMCICompiler` with `EnableJVMCI` so that JVMCI code paths are taken when JVMCI is only used for non-CompilerBroker compilations.
>
> Doug Simon has updated the pull request incrementally with one additional commit since the last revision:
> 
>   clarified doc for EnableJVMCI and UseJVMCINativeLibrary

Thanks for the reviews.

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PR Comment: https://git.openjdk.org/jdk/pull/21120#issuecomment-2377780416