Add files from parent branch HEAD:

	src/backend/access/transam/xlogutils.c
	src/backend/catalog/heap.c
	src/backend/catalog/index.c
	src/backend/commands/tablecmds.c
	src/backend/postmaster/bgwriter.c
	src/backend/rewrite/rewriteDefine.c
	src/backend/storage/buffer/bufmgr.c
	src/backend/storage/buffer/localbuf.c
	src/backend/storage/smgr/smgr.c
	src/backend/utils/cache/relcache.c
	src/include/storage/smgr.h
	src/include/utils/rel.h
	src/include/utils/relcache.h