RFR: 8302870: More information needed from failures in vmTestbase ThreadUtils.waitThreadState [v2]

[Kevin Walls]

> Test update to make failures such as JDK-8076494 more informative.
> 
> Waiting for a thread to change state: give more time (to distinguish a real deadlock from some other delay), and log the thread stackframes when the expected state change is not observed.

Kevin Walls has updated the pull request incrementally with one additional commit since the last revision:

  nits

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12661/files
  - new: https://git.openjdk.org/jdk/pull/12661/files/6e930abf..7e45ff0e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12661&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12661&range=00-01

  Stats: 18 lines in 1 file changed: 0 ins; 0 del; 18 mod
  Patch: https://git.openjdk.org/jdk/pull/12661.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12661/head:pull/12661

PR: https://git.openjdk.org/jdk/pull/12661