RFR: 8316147: Remove serviceability/sa/TestJhsdbJstackMixed.java from -Xcomp problem list

Tue Sep 12 23:37:52 UTC 2023

[JDK-8248675](https://bugs.openjdk.org/browse/JDK-8248675) no longer seems to be reproducing, even before [JDK-8313800](https://bugs.openjdk.org/browse/JDK-8313800) was just pushed. I'm not sure what may have fixed it, but even if the bug was potentially still there, it has likely been fixed by [JDK-8313800](https://bugs.openjdk.org/browse/JDK-8313800). `serviceability/sa/TestJhsdbJstackMixed.java` should be removed from the problem list.

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Commit messages:
 - remove from problem list

Changes: https://git.openjdk.org/jdk/pull/15696/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15696&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316147
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15696.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15696/head:pull/15696

PR: https://git.openjdk.org/jdk/pull/15696