RFR: 8289004: investigate if SharedRuntime::get_java_tid parameter should be a JavaThread*

[Robbin Ehn]

Hi, please consider.

Yes it should be JavaThread*.
But some additional places needed to use JavaThread*

Passes t1-3.

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Commit messages:
 - JavaThread

Changes: https://git.openjdk.org/jdk/pull/10532/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10532&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289004
  Stats: 26 lines in 5 files changed: 3 ins; 3 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/10532.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10532/head:pull/10532

PR: https://git.openjdk.org/jdk/pull/10532