lib: radix-tree: add entry deletion support to __radix_tree_replace()

lib: radix-tree: add entry deletion support to __radix_tree_replace()

Page cache shadow entry handling will be a lot simpler when it can use a
single generic replacement function for pages, shadow entries, and
emptying slots.

Make __radix_tree_replace() properly account insertions and deletions in
node->count and garbage collect nodes as they become empty.  Then
re-implement radix_tree_delete() on top of it.

Link: http://lkml.kernel.org/r/20161117193058.GC23430@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox <mawilcox@linuxonhyperv.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>