RFR: 8285595: Assert frame anchor doesn't change in safepoints/handshakes

[Robbin Ehn]

On Tue, 26 Apr 2022 15:30:31 GMT, Ron Pressler <rpressler at openjdk.org> wrote:

> Hi.
> Please review this change that asserts that the frame anchor is not changed by safepoints/handshakes.
> 
> — Ron

Marked as reviewed by rehn (Reviewer).

Thanks, looks good.

(note to readers: this assert is added in preparation for continuations (virtual threads/loom))

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PR: https://git.openjdk.java.net/jdk/pull/8402