RFR: 8193559: ugly DO_JAVA_THREADS macro should be replaced [v4]

[Kim Barrett]

On Fri, 30 Jul 2021 16:24:33 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> src/hotspot/share/runtime/threadSMR.inline.hpp line 53:
>> 
>>> 51:   assert_not_singular();
>>> 52:   assert_same_list(i);
>>> 53:   return _thread_ptr != i._thread_ptr;
>> 
>> Better might be to have the entire body consist of `return operator==(i);`.
>
> I think what's there is more clear. If we switch to `return operator==(i)`,
> then I think that will lead to some head scratching. Especially since it's
> making me wonder right now...

And _obviously_ I meant `return !operator==(i)`.  Need to keep that all-important one-character difference...

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PR: https://git.openjdk.java.net/jdk/pull/4671