SL-15628 Crash inside ~LLModelInstanceBase

More explicit cleanup in hopes of narrowing down which of the models
failed

indra/llmath/llvolume.h

@@ -1000,7 +1000,7 @@ class LLVolume : public LLRefCount
 	friend class LLVolumeLODGroup;
 
 protected:
-	~LLVolume(); // use unref
+	virtual ~LLVolume(); // use unref
 
 public:
 	typedef std::vector<LLVolumeFace> face_list_t;

indra/llprimitive/llmodel.cpp

@@ -67,6 +67,7 @@ LLModel::~LLModel()
 	{
 		LLConvexDecomposition::getInstance()->deleteDecomposition(mDecompID);
 	}
+    mPhysics.mMesh.clear();
 }
 
 //static

indra/llprimitive/llmodel.h

@@ -106,6 +106,8 @@ public:
 		std::vector<LLVector3> mPositions;
 		std::vector<LLVector3> mNormals;
 
+        ~PhysicsMesh() {}
+
 		void clear()
 		{
 			mPositions.clear();
@@ -131,6 +133,7 @@ public:
 	public:
 		Decomposition() { }
 		Decomposition(LLSD& data);
+		~Decomposition() { }
 		void fromLLSD(LLSD& data);
 		LLSD asLLSD() const;
 		bool hasHullList() const;
@@ -365,7 +368,7 @@ class LLModelInstanceBase
 {
 public:
 	LLPointer<LLModel> mModel;
-	LLPointer<LLModel> mLOD[5];
+	LLPointer<LLModel> mLOD[LLModel::NUM_LODS];
 	LLUUID mMeshID;
 
 	LLMatrix4 mTransform;
@@ -380,6 +383,15 @@ public:
 		: mModel(NULL)
 	{
 	}
+
+    virtual ~LLModelInstanceBase()
+    {
+        mModel = NULL;
+        for (int j = 0; j < LLModel::NUM_LODS; ++j)
+        {
+            mLOD[j] = NULL;
+        }
+    };
 };
 
 typedef std::vector<LLModelInstanceBase> model_instance_list;
@@ -399,6 +411,8 @@ public:
 
 	LLModelInstance(LLSD& data);
 
+    ~LLModelInstance() {}
+
 	LLSD asLLSD();
 };
 

indra/newview/llmodelpreview.cpp

@@ -220,6 +220,16 @@ LLModelPreview::~LLModelPreview()
         mPreviewAvatar->markDead();
         mPreviewAvatar = NULL;
     }
+
+    mUploadData.clear();
+    mTextureSet.clear();
+
+    for (U32 i = 0; i < LLModel::NUM_LODS; i++)
+    {
+        clearModel(i);
+    }
+    mBaseModel.clear();
+    mBaseScene.clear();
 }
 
 void LLModelPreview::updateDimentionsAndOffsets()

indra/newview/llmodelpreview.h

@@ -310,7 +310,6 @@ protected:
     vv_LLVolumeFace_t mBaseModelFacesCopy;
 
     U32 mGroup;
-    std::map<LLPointer<LLModel>, U32> mObject;
 
     // Amount of triangles in original(base) model
     U32 mMaxTriangleLimit;