RFR: 8338383: Implement JEP 491: Synchronize Virtual Threads without Pinning [v12]

[Patricio Chilano Mateo]

On Mon, 28 Oct 2024 20:10:16 GMT, Dean Long <dlong at openjdk.org> wrote:

>> It's the offset of the mirror passed to static native calls.  It pre-existed saving the mirror in all frames to keep the Method alive, and is duplicated.  I think this could be cleaned up someday, which would remove this special case.
>
> I tried to track down how interpreter_frame_num_oops() is used, and as far as I can tell, it is only used to compare against the bitmap in debug/verify code.  So if this slot was added here, shouldn't there be a corresponding change for the bitmap?

When creating the bitmap, processing oops in an interpreter frame is done with `frame::oops_interpreted_do()` which already counts this extra oop for native methods.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21565#discussion_r1819757374