For legacy reasons, some instance fields are aliased. The aliases have
the same definition but appear under different names. Support for such
fields has been added to Query/Common.hs
As aliases can cause somewhat harder to find bugs, a new test was
added as well.

Signed-off-by: Hrvoje Ribicic <riba@google.com>
Reviewed-by: Jose A. Lopes <jabolopes@google.com>