MDEV-32175 References to buf_page_t::frame may cost some performance

[dr-m]

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• [x] The Jira issue number for this PR is: MDEV-32175

Description

This is work in progress, for performance testing. We are reducing the number of accesses to buf_page_t::frame, because there is an idea to remove that data member and to replace it with a member function that would perform some pointer arithmetics.

Based on the outcome, we might want to revert changes that cause additional calls to page_offset() or page_align().

Release Notes

This does not need to be mentioned, because this is a relatively small performance improvement or code cleanup.

How can this PR be tested?

This is a low-level change that is covered by the regression test suite. It should be tested with RQG as well.

A small part of this depends on #3069.

Basing the PR against the correct MariaDB version

• [ ] This is a new feature and the PR is based against the latest MariaDB development branch.
• [ ] This is a bug fix and the PR is based against the earliest maintained branch in which the bug can be reproduced.

This is a code cleanup or a performance improvement.

PR quality check

• [x] I checked the CODING_STANDARDS.md file and my PR conforms to this where appropriate.
• [ ] For any trivial modifications to the PR, I am ok with the reviewer making the changes themselves.

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