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

[Dean Long]

On Mon, 28 Oct 2024 22:52:40 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> 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.
>
> What are we counting now with MaskFillerForNativeFrame that we weren't counting before this change?  in MaskFillerForNative::set_one.

So it sounds like the adjustment at line 119 is a bug fix, but what I don't understand is why we weren't seeing problems before.  Something in this PR exposed the need for this change.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21565#discussion_r1819887000