RFR: JDK-8313796: AsyncGetCallTrace crash on unreadable interpreter method pointer

[Richard Startin]

We have observed invalid pointers to the interpreted method at Datadog. The fix is based on a discussion with and a code snippet from @parttimenerd.

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Commit messages:
 - JDK-8313796: AsyncGetCallTrace crash on unreadable interpreter method pointer

Changes: https://git.openjdk.org/jdk/pull/15178/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15178&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313796
  Stats: 25 lines in 5 files changed: 19 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/15178.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15178/head:pull/15178

PR: https://git.openjdk.org/jdk/pull/15178