pipeline: CycleData should always inherit from MemoryBase
pipeline: CycleData should always inherit from MemoryBase

We need to guarantee that CData classes are aligned properly, even if DO_PIPELINING is not enabled.

chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d