Add an experimental fix to avoid attempting to mmap memory from an offset that is not a multiple of the system page size on systems with page sizes larger than 32KB.
Add a test to ensure os_unix.c works with 64KiB OS pages.
Avoid attempting to mmap memory from an offset that is not a multiple of the system page size on systems with page sizes larger than 32KB.
Fix arithmetic operators so that they do not change the affinity of their
input operands.  Ticket [a8a0d2996a].
Remove unused variables Parse.nColCache and Parse.iColCache.