RFR: 8321509: False positive in get_trampoline fast path causes crash [v4]

[Dean Long]

> 8321509: False positive in get_trampoline fast path causes crash

Dean Long has updated the pull request incrementally with one additional commit since the last revision:

  restore optimization

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19796/files
  - new: https://git.openjdk.org/jdk/pull/19796/files/09ed1da4..5845db59

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19796&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19796&range=02-03

  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 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