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

[Doug Simon]

On Sun, 11 Apr 2021 10:25:47 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

>> Vladimir Kozlov 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 three additional commits since the last revision:
>> 
>>  - Restore Graal Builder image makefile
>>  - Merge latest changes from branch 'JDK-8264805' into JDK-8264806
>>  - 8264806: Remove the experimental JIT compiler
>
> 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.

> @dougxc I restored Compiler::isGraalEnabled().

Thanks. I guess this should really be named `isJVMCICompilerEnabled` now and the `vm.graal.enabled` predicate renamed to `vm.jvmcicompiler.enabled` but maybe that's too big a change (or can be done later).

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