Log Message:
-----------
Assert that BufferIsPinned() in IncrBufferRefCount(), rather than using
a home-brewed combination of assertions that boiled down to the same
thing.
Modified Files:
--------------
pgsql/src/backend/storage/buffer:
bufmgr.c (r1.181 -> r1.182)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/buffer/bufmgr.c.diff?r1=1.181&r2=1.182)