bugfix: alignment calculation on hash-entry.

hkey_offset begins from 13. (3 * sizeof(cl_uint) + sizeof(cl_char)),
then nullmap and hash-key values will follow.
Because of alignment restriction, hash-key has to be placed on the
aligned location. However, we didn't update the offset value on the
deployment of 1st argument. It leads incorrect location to the 2nd
argument.
Merge branch 'master' into preagg
remove commit junk
Merge branch 'master' into preagg