[sql] Verify regexp not cached with prepared statement.

When the bug was logged, SQLite had a flaw where the regular
expression (Y in X REGEXP Y or REGEXP(Y,X)) effectively had the
compiled results cached with the prepared statement.  At some point
Chromium pulled a version of SQLite which fixed this, this test
verifies that the SQLite currently in use has the fix.

BUG=248608
[email protected]

Review-Url: https://chromiumcodereview.appspot.com/2440653002
Cr-Commit-Position: refs/heads/master@{#426398}
1 file changed