Removing typename from A_Const (was: Empty arrays with ARRAY[])

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On Fri, Mar 21, 2008 at 7:47 AM, Tom Lane  wrote:
>  I didn't do anything about removing A_Const's typename field, but I'm
>  thinking that would be a good cleanup patch.
>

Here's my attempt to remove the typename field from A_Const.  There
were a few places (notably flatten_set_variable_args() in guc.c, and
typenameTypeMod() in parse_type.c) where the code expected to see an
A_Const with a typename, and I had to adjust for an A_Const within a
TypeCast.  Nonetheless, there was an overall net reduction of 34 lines
of code, so I think this was a win.

All regression tests passed on x86_64 gentoo.

Added to May CommitFest.

Cheers,
BJ
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