Breakout BTRFS_SETGET_FUNCS into a separate C file, the inlines were too big.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --cc fs/btrfs/Makefile
Simple merge

diff --cc fs/btrfs/ctree.c
Simple merge

diff --cc fs/btrfs/ctree.h
Simple merge

diff --cc fs/btrfs/extent-tree.c
Simple merge

diff --cc fs/btrfs/struct-funcs.c
Simple merge

diff --cc fs/btrfs/tree-defrag.c
Simple merge