MDEV-34909 DDL hang during SET GLOBAL innodb_log_file_size on PMEM

[dr-m]

• The Jira issue number for this PR is: MDEV-34909

Description

Executing a DDL operation concurrently with SET GLOBAL innodb_log_file_size could lead to a hang of most InnoDB threads.

log_t::persist(): Add a parameter holding_latch to specify whether the caller is already holding exclusive log_sys.latch, like log_write_and_flush() always is.

Release Notes

Executing a DDL operation concurrently with SET GLOBAL innodb_log_file_size when ib_logfile0 resides on a mount -o dax file system (persistent memory mapped log) could lead to a hang of most InnoDB threads.

How can this PR be tested?

Build with CMAKE_CXX_FLAGS including -DLOG_LATCH_DEBUG.

./mtr --parallel=auto innodb.log_file_size_online

Basing the PR against the correct MariaDB version

• This is a new feature or a refactoring, and the PR is based against the main branch.
• This is a bug fix, and the PR is based against the earliest maintained branch in which the bug can be reproduced.

PR quality check

• 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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