RFR: 8346460: NotifyFramePop should return JVMTI_ERROR_DUPLICATE [v6]

[Serguei Spitsyn]

> The JVMTI NotifyFramePop should return JVMTI_ERROR_DUPLICATE in a case the specified FramePop event was already requested. This makes it consistent with the SetBreakpoint which returns the JVMTI_ERROR_DUPLICATE on an attempt to add a breakpoint request that was already requested.
> 
> CSR: [8346460](https://bugs.openjdk.org/browse/JDK-8346460): NotifyFramePop should return JVMTI_ERROR_DUPLICATE
> 
> Testing:
>  - tested with mach5 tiers 1-6

Serguei Spitsyn has updated the pull request incrementally with one additional commit since the last revision:

  update copyright year

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22798/files
  - new: https://git.openjdk.org/jdk/pull/22798/files/2468357f..fbf9459d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22798&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22798&range=04-05

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22798.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22798/head:pull/22798

PR: https://git.openjdk.org/jdk/pull/22798