RFR: 8297967: Make frame::safe_for_sender safer [v6]

[Johannes Bechberger]

On Mon, 24 Apr 2023 09:52:05 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> Makes `frame::safe_for_sender` safer by checking that the location of the return address, sender stack pointer, and link address is accessible. This makes the method safer in the case of broken frames.
>
> Johannes Bechberger has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains four commits:
> 
>  - Remove errorneously added check
>  - Remove check for value that might be null
>  - More SafeFetch
>  - Make frame::safe_for_sender safer with SafeFetch

This might possible. I'll work on it then next week.

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PR Comment: https://git.openjdk.org/jdk/pull/11461#issuecomment-1574791022