RFR: 8321509: false positive in get_trampoline fast path causes crash

[Dean Long]

8321509: false positive in get_trampoline fast path causes crash

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Commit messages:
 - Merge branch 'openjdk:master' into 8321509
 - Merge branch 'openjdk:master' into 8321509
 - first draft

Changes: https://git.openjdk.org/jdk/pull/19796/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19796&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321509
  Stats: 65 lines in 6 files changed: 32 ins; 14 del; 19 mod
  Patch: https://git.openjdk.org/jdk/pull/19796.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19796/head:pull/19796

PR: https://git.openjdk.org/jdk/pull/19796