Merge change from MySQL (this almost fixes the failing innodb test):

  ChangeSet@1.2613, 2008-05-07 09:58:21+04:00, sergefp@mysql.com +5 -0
    BUG#35850 "Performance regression in 5.1.23/5.1.24"
    - Disable the "prefer full scan on clustered primary key over full scan
      of any secondary key" rule introduced by BUG#35850.
    - Update test results accordingly
    (bk trigger: file this for BUG#35850)
  
    mysql-test/r/innodb.result@1.214, 2008-05-07 09:57:31+04:00, sergefp@mysql.com +15 -15
      BUG#35850 "Performance regression in 5.1.23/5.1.24"
      - Update test results