Cycles microdisplacement: Support for Catmull-Clark subdivision via OpenSubdiv

Enables Catmull-Clark subdivision meshes with support for creases and attribute
subdivision. Still waiting on OpenSubdiv to fully support face varying
interpolation for subdividing uv coordinates tho. Also there may be some
inconsistencies with Blender's subdivision which will be resolved at a
later time.

Code for reading patch tables and creating patch maps is borrowed
from OpenSubdiv.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D2111

intern/cycles/render/object.h

@@ -97,6 +97,8 @@ public:
 	                         Scene *scene,
 	                         Progress& progress,
 	                         bool bounds_valid = true);
+	void device_update_patch_map_offsets(Device *device, DeviceScene *dscene, Scene *scene);
+
 	void device_free(Device *device, DeviceScene *dscene);
 
 	void tag_update(Scene *scene);