RFR: dcubed - misc cleanups of jvm.cpp and JVM/TI files.

[Daniel D.Daugherty]

On Thu, 7 Apr 2022 18:32:56 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

> Misc cleanups of jvm.cpp and JVM/TI files.

One of the less obvious cleanups is to move the associated locals closer to
`get_threadOop_and_JavaThread()` calls to reduce the scope of the locals.

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PR: https://git.openjdk.java.net/loom/pull/140