RFR: 8288532: additional review changes for JDK-8286830 [v4]

[Daniel D. Daugherty]

> Update a couple of tests that were modified by JDK-8286830. Now the tests properly
> honor any specified time limit by splitting the time between both sub-tests.
> Also pick up a sanity check based on JDK-8288497 that I've been using in recent
> stress testing.

Daniel D. Daugherty has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 17 commits:

 - Merge branch 'master' into JDK-8288532
 - VMThread can get to check in AsyncExceptionHandshake() dtr via a bailout.
 - Check in AsyncExceptionHandshake() dtr can assume the caller is a JavaThread.
 - update after 8288497 v01 code review changes
 - Merge branch 'JDK-8288139' into JDK-8288532
 - update after 8288497 v01 code review changes
 - Merge branch 'JDK-8288497' into JDK-8288139
 - Rename cannot_access_oops_safely to is_oop_safe and invert the function's logic.
 - update after 8288497 v00 code review changes
 - Merge branch 'JDK-8288139' into JDK-8288532
 - ... and 7 more: https://git.openjdk.org/jdk19/compare/a1449886...9fa9d1d6

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Changes: https://git.openjdk.org/jdk19/pull/32/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=32&range=03
  Stats: 13 lines in 3 files changed: 10 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk19/pull/32.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/32/head:pull/32

PR: https://git.openjdk.org/jdk19/pull/32