RFR: 8264806: Remove the experimental JIT compiler [v2]

[Doug Simon]

On Sat, 10 Apr 2021 17:41:05 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Marked as reviewed by iignatyev (Reviewer).
>
> Thank you, Igor. I filed https://bugs.openjdk.java.net/browse/JDK-8265032

We would definitely like to be able to continue testing of GraalVM with the JDK set of jtreg tests. So keeping `Compiler::isGraalEnabled()` working like it does today is important.

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PR: https://git.openjdk.java.net/jdk/pull/3421