[jdk19] RFR: 8289091: move oop safety check from SharedRuntime::get_java_tid() to JavaThread::threadObj()

[Daniel D. Daugherty]

On Sun, 26 Jun 2022 21:06:07 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> A trivial move of the oop safety check from SharedRuntime::get_java_tid() to
>> JavaThread::threadObj(). Also made adjustments to the threadObj() calls in
>> JavaThread::print_on_error() and JavaThread::get_thread_name_string() so
>> that we don't get secondary crashes when a JavaThread crashes after it has
>> detached the GC barrier.
>> 
>> Tested with Mach5 Tier[1-7]. A Mach5 Tier8 will be started this weekend.
>
> Looks fine to me, thanks!

@robehn - Thanks for the review.
@dholmes-ora - Thanks for the review. I need to rework the "other adjustments"
portion of the fix.

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PR: https://git.openjdk.org/jdk19/pull/69