Major patch to speed up backend startup after profiling analysis.

src/backend/access/common/heaptuple.c

src/backend/access/common/heapvalid.c

src/backend/storage/ipc/s_lock.c

src/backend/storage/page/bufpage.c

src/backend/utils/adt/oid.c

src/backend/utils/cache/catcache.c

src/backend/utils/mmgr/oset.c

src/include/c.h

src/include/storage/bufpage.h