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

[Daniel D. Daugherty]

On Fri, 24 Jun 2022 19:53:31 GMT, Daniel D. Daugherty <dcubed 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.

@dholmes-ora, @fisk, @pchilano, and @robehn - This is a followup from
[JDK-8288139](https://bugs.openjdk.org/browse/JDK-8288139) JavaThread touches oop after GC barrier is detached

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