Fix for BUG#8578 "Test case 'index_merge_ror' fails on SGI irix"   Take into account that bitmap_is_set() may return any non-zero zero value when the bit is set.
Fix for BUG#8578 "Test case 'index_merge_ror' fails on SGI irix"
  Take into account that bitmap_is_set() may return any non-zero zero value when the bit is set.




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