Refactor assembly of external on-disk TOAST pointers

toast_save_datum() ended with two copies of the same three steps, one
each external on-disk TOAST pointer: allocate a datum, set its tag, then
copy the contents from a varatt_external_oid or a varatt_external_oid8
into it.

These steps are moved into a new helper function, toast_pointer_build(),
which takes the tag and a pointer to the struct and derives everything
else from the tag.  For now, only two varatt_external_* exist for
external on-disk TOAST pointers.  Some more are under discussion, where
this refactoring shows some benefits in the shape of less duplication.

There should be no behavior change.

Author: Nikhil Kumar Veldanda <[email protected]>
Discussion: 
https://postgr.es/m/cafafj_fejqzrkyvn7ur0ajx8iz8sr14nhevjnyc8jnoqtmx...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/74f7f684d6ed1fd3c3aee4d868f2e6d1da0ec93b

Modified Files
--------------
src/backend/access/common/toast_internals.c | 28 ++++++++++++++++++++++------
1 file changed, 22 insertions(+), 6 deletions(-)

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