freed-pool: Enlarge the freed cache

Clips end up recursing more than 4 levels and so we need a larger stash
to avoid mallocs.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

src/cairo-freed-pool-private.h

@@ -44,7 +44,7 @@
 /* Keep a stash of recently freed clip_paths, since we need to
  * reallocate them frequently.
  */
-#define MAX_FREED_POOL_SIZE 4
+#define MAX_FREED_POOL_SIZE 16
 typedef struct {
     void *pool[MAX_FREED_POOL_SIZE];
     int top;