Log Message:
-----------
If RelationBuildDesc() fails to open a critical system index, PANIC with
a relevant error message instead of just dumping core. Odd that nobody
reported this before Darren Reed.
Modified Files:
--------------
pgsql/src/backend/utils/cache:
relcache.c (r1.266 -> r1.267)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/cache/relcache.c?r1=1.266&r2=1.267)