Make btParallelConstraintSolver 64-bit ready

add an optional assert method for the btCollisionDispatcher, to make sure the contact pool is contiguous (needed for btParallelConstraintSolver)

src/BulletCollision/CollisionDispatch/btCollisionDispatcher.h

@@ -67,7 +67,8 @@ public:
 	enum DispatcherFlags
 	{
 		CD_STATIC_STATIC_REPORTED = 1,
-		CD_USE_RELATIVE_CONTACT_BREAKING_THRESHOLD = 2
+		CD_USE_RELATIVE_CONTACT_BREAKING_THRESHOLD = 2,
+		CD_DISABLE_CONTACTPOOL_DYNAMIC_ALLOCATION = 4
 	};
 
 	int	getDispatcherFlags() const
@@ -155,6 +156,16 @@ public:
 		m_collisionConfiguration = config;
 	}
 
+	virtual	btPoolAllocator*	getInternalManifoldPool()
+	{
+		return m_persistentManifoldPoolAllocator;
+	}
+
+	virtual	const btPoolAllocator*	getInternalManifoldPool() const
+	{
+		return m_persistentManifoldPoolAllocator;
+	}
+
 };
 
 #endif //BT_COLLISION__DISPATCHER_H