RFR: 8378549: Incorrect assert in JvmtiThreadState::update_for_pop_top_frame

[Serguei Spitsyn]

There is an incorrect assert in the function `JvmtiThreadState::update_for_pop_top_frame()`. The assumption is that the interp_only_mode has to be set if the `JVMTI_EVENT_FRAME_POP` event is enabled. This is overly strong statement. The JVMTI `SetEventNotificationMode` enables events and then submits a Handshake to enable `interp_only_mode` to support the events. So, there is a gap between enabling the events and enabling the `interp_only_mode`. 

Testing: N/A

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Commit messages:
 - 8378549: Incorrect assert in JvmtiThreadState::update_for_pop_top_frame

Changes: https://git.openjdk.org/jdk/pull/29890/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29890&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378549
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/29890.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29890/head:pull/29890

PR: https://git.openjdk.org/jdk/pull/29890