RFR: 8295099: vmTestbase/nsk/stress/strace/strace013.java failed with "TestFailure: wrong lengths of stack traces: strace013Thread0: NNN strace013Thread83: MMM"

[David Holmes]

The test is incorrectly synchronized and may take the stack trace of a thread before it has entered the wait() and thus be three frames short of the correct stack. So I cleaned that up to ensure things are correctly synchronized.

A number of comments in the test description etc were wrong so I also fixed those.

These tests are stylistically awful but I refrained from embarking on a major cleanup and adopted the prevailing styles.

Testing: local plus 50x on each platform (in progress)

Thanks.

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Commit messages:
 - 8295099: vmTestbase/nsk/stress/strace/strace013.java failed with "TestFailure: wrong lengths of stack traces: strace013Thread0: NNN strace013Thread83: MMM"

Changes: https://git.openjdk.org/jdk/pull/11011/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11011&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295099
  Stats: 30 lines in 1 file changed: 8 ins; 13 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/11011.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11011/head:pull/11011

PR: https://git.openjdk.org/jdk/pull/11011