The crash is eliminated but still it is weird/inefficent that ROR-intersection is used when performing updates in empty table.


mysql-test/r/index_merge_ror_cpk.result:
  Fix and testcase for BUG#4984
mysql-test/t/index_merge_ror_cpk.test:
  Fix and testcase for BUG#4984
sql/opt_range.cc:
  Don't call index_end() for CPK quick select inside of a ROR-intersection.
sql/opt_range.h:
  Fix and testcase for BUG#4984