RFR: 8369609: Continuations preempt_epilog is missing a call to invalidate_jvmti_stack

[Serguei Spitsyn]

This is a simple fix to add missing call to `invalidate_jvmti_stack()` to the `freeze_epilog(ContinuationWrapper& cont)`.

Testing:
- TBD: Run mach5 tiers 1-6

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Commit messages:
 - 8369609: Continuations preempt_epilog is missing a call to invalidate_jvmti_stack

Changes: https://git.openjdk.org/jdk/pull/27878/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27878&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369609
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27878.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27878/head:pull/27878

PR: https://git.openjdk.org/jdk/pull/27878