[jdk21] RFR: 8303086: SIGSEGV in JavaThread::is_interp_only_mode()

[Serguei Spitsyn]

Clean backport from mainline jdk repo to jdk21 for the fix of:
  [8303086](https://bugs.openjdk.org/browse/JDK-8303086): SIGSEGV in JavaThread::is_interp_only_mode()

Testing:
 - TBD: mach5 tiers 1-5

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Commit messages:
 - Backport 971c2efb698065c65dcf7373d8c3027f58d5f503

Changes: https://git.openjdk.org/jdk21/pull/96/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=96&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303086
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21/pull/96.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/96/head:pull/96

PR: https://git.openjdk.org/jdk21/pull/96