RFR: 8328758: GetCurrentContendedMonitor function should use JvmtiHandshake

[Serguei Spitsyn]

On Fri, 22 Mar 2024 02:44:38 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

> The internal JVM TI `JvmtiHandshake` and `JvmtiUnitedHandshakeClosure` classes were introduced in the JDK 22 to unify/simplify the JVM TI functions supporting implementation of the virtual threads. This enhancement is to refactor JVM TI `GetCurrentContendedMonitor` function on the base of `JvmtiHandshake` and `JvmtiUnitedHandshakeClosure` classes.
> 
> Testing:
>  - Ran mach5 tiers 1-6

Leonid and Patricio, thank you for review.

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PR Comment: https://git.openjdk.org/jdk/pull/18444#issuecomment-2019103923