Add an ORDER BY test case to speedtest1.c
Add another performance test case to speedtest1.  This case is another
ORDER BY test but this time without LIMIT.
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 from trunk the fix for the crash on a corrupt database.