[HACKERS] make more use of RoleSpec struct

Here is a small cleanup patch to make more use of the RoleSpec
struct/node throughout the parser to avoid casts and make the code more
self-documenting.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


-- 
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers