Cycles: Add human readable sizes to debug output

Some of these values can get quite large and are hard to read, adding this
makes it easy to read them at a glance.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D2039

intern/cycles/device/device_cuda.cpp

@@ -493,7 +493,9 @@ public:
 	               InterpolationType interpolation,
 	               ExtensionType extension)
 	{
-		VLOG(1) << "Texture allocate: " << name << ", " << mem.memory_size() << " bytes.";
+		VLOG(1) << "Texture allocate: " << name << ", "
+		        << string_human_readable_number(mem.memory_size()) << " bytes. ("
+		        << string_human_readable_size(mem.memory_size()) << ")";
 
 		/* Check if we are on sm_30 or above.
 		 * We use arrays and bindles textures for storage there */