Speed up of particular inefficient part related to motions.

For these standard motions, the viewer likes to very frequently
flood-call startMotion/stopMotion sometimes, which at the very
least needs a LLUUID lookup in a std::map. In particular, this
is done for two of them for every avatar in the sim every frame.
This code makes it possible to test if that makes sense by
merely doing a bit test.

Conflicts:
	indra/llcharacter/llkeyframemotion.h

indra/newview/llphysicsmotion.cpp

@@ -314,8 +314,8 @@ void LLPhysicsMotion::getString(std::ostringstream &oss)
 	}
 } 
 
-LLPhysicsMotionController::LLPhysicsMotionController(const LLUUID &id) : 
-        LLMotion(id),
+LLPhysicsMotionController::LLPhysicsMotionController(LLUUID const& id, LLMotionController& controller) : 
+        AIMaskedMotion(id, controller, ANIM_AGENT_PHYSICS_MOTION),
         mCharacter(NULL),
 		mIsDefault(true)
 {
@@ -332,15 +332,6 @@ LLPhysicsMotionController::~LLPhysicsMotionController()
         }
 }
 
-BOOL LLPhysicsMotionController::onActivate() 
-{ 
-        return TRUE; 
-}
-
-void LLPhysicsMotionController::onDeactivate() 
-{
-}
-
 LLMotion::LLMotionInitStatus LLPhysicsMotionController::onInitialize(LLCharacter *character)
 {
         mCharacter = character;
@@ -889,4 +880,4 @@ void LLPhysicsMotion::reset()
 			mCharacter->setVisualParamWeight((*iter).mParam,(*iter).mParam->getDefaultWeight());
 		}
 	}
-} 
+}