Adjust the repeat counts on several tests in speedtest1 so that the relative
time spent on the test is roughly the same regardless of --size.
Add an assert() and a comment to clarify the operation of the
vdbeRecordCompareInt() routine.
Earlier detection of corruption in sqlite3VdbeRecordCompare() in order to
avoid a potential buffer overread.
Add a test case to verify that the previous change avoids excess buffer
overread in sqlite3VdbeRecordCompare().
Add an extra test case for the potential buffer overread patched by [28ddecff04].
Merge the latest trunk changes and the fix for the crash on a corrupt
database.