RFR: 8242440: use separate, destroyable JavaVM instances per libgraal compiler thread [v2]

[Doug Simon]

On Sun, 17 Apr 2022 02:25:40 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Doug Simon has updated the pull request incrementally with six additional commits since the last revision:
>> 
>>  - avoid use of jobject for oop handles implementing foreign object references in libjvmci heap to HotSpot heap objects
>>  - inlined JVMCIRuntime::_jobjects
>>  - replace NULL with nullptr
>>  - added JVMCIRuntime_lock global
>>  - replace enum with const definition
>>  - rename thread parameter to current
>
> src/hotspot/share/compiler/abstractCompiler.hpp line 170:
> 
>> 168:   // Notifies this compiler that the current thread (`thread`) is about to stop.
>> 169:   // The current thread currently holds the CompileThread_lock.
>> 170:   virtual void stopping_compiler_thread(CompilerThread* thread) {
> 
> If `thread` is the current thread then I'd recommend calling it `current` so that this is clear.

Fixed: https://github.com/openjdk/jdk/pull/8262/commits/f448c2f6f859aea772a748458cbd336a8744afed

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PR: https://git.openjdk.java.net/jdk/pull/8262