- row_search_mvcc() should return DB_INTERRUPTED when it got killed.
- Add a syncpoint for the ICP check.
- Add test coverage for killed-during-ICP-check scenario
Backport of MDEV-22761 fixes for ICP from 10.4 commits:
* a6f956488c
* c03885cd9c
XtraDB was fixed in deb3b9a174
Reviewer: Daniel Black