Re: Symbolic names for the values of typalign and typstorage

I wrote:
> Alvaro Herrera <alvherre@2ndquadrant.com> writes:
>> On 2020-Mar-03, Tom Lane wrote:
>>> I realized that a possible compromise position is to have tupmacs.h
>>> include pg_type_d.h, not the whole pg_type.h header, thus dodging the
>>> indirect inclusions.  That still brings in the type-OID macros, but
>>> it's a lot less header scope creep than I was first fearing.

>> WFM.

> OK, I'll look harder at doing it that way.

Yeah, that works out very nicely: there's now only one place besides
tupmacs.h that needs a new #include.

I did a little more polishing, and consider the attached committable,
unless anyone has objections.

			regards, tom lane