RFR: 8223312: Utilize handshakes instead of is_thread_fully_suspended [v2]

[Richard Reingruber]

On Tue, 20 Oct 2020 19:42:38 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> Thanks, I'm exploring what we need to execute the EB inside the handshake.

I want to experiment with object reallocation without referencing a frame. I think a should be possible to reallocate
objects given only the corresponding compiled pc. If so, then a handshake/vm operation can fail with the request to
reallocate objects at a pc. This can be done concurrently and then the handshake/vm operation can be restarted.

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PR: https://git.openjdk.java.net/jdk/pull/729