RFR: 8345422: Fix JNI Checker "in native method" warnings in the debug agent and debugger tests [v2]

[Chris Plummer]

On Wed, 4 Dec 2024 23:02:32 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>>> What I'm not so sure of is which JNI functions check this flag (I know only the "call" functions set it)
>> 
>> In `invokeNonVirtual` we calls `CallNonvirtualObjectMethodA` JNI function and then call `saveGlobalRef`, it looks strange if the case don't cause the warning.
>
> I've not sure if NewGlobalRef checks the flag or only checks if there is actually a pending exception. I'm trying to find that out.

Looks like we don't have a test case for invokeNonVirtual with an Object result. I'll update this to use saveGlobalRefHelper() also.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22528#discussion_r1870467853