Protect against stack overflow caused by deep recursive calls

* PPTC version bump

* Also reset call depth when not using the unmanaged dispatch loop

* Increment call depth on function start rather than before call

src/ARMeilleure/State/ExecutionContext.cs

@@ -137,6 +137,11 @@ namespace ARMeilleure.State
         public bool GetFPstateFlag(FPState flag) => _nativeContext.GetFPStateFlag(flag);
         public void SetFPstateFlag(FPState flag, bool value) => _nativeContext.SetFPStateFlag(flag, value);
 
+        internal void ResetCallDepth()
+        {
+            _nativeContext.ResetCallDepth();
+        }
+
         internal void CheckInterrupt()
         {
             if (Interrupted)

src/ARMeilleure/State/NativeContext.cs

@@ -21,6 +21,7 @@ namespace ARMeilleure.State
             public ulong ExclusiveValueLow;
             public ulong ExclusiveValueHigh;
             public int Running;
+            public int CallDepth;
             public long Tpidr2El0;
             
             /// <summary>
@@ -197,6 +198,8 @@ namespace ARMeilleure.State
         public bool GetRunning() => GetStorage().Running != 0;
         public void SetRunning(bool value) => GetStorage().Running = value ? 1 : 0;
 
+        public void ResetCallDepth() => GetStorage().CallDepth = 0;
+
         public unsafe static int GetRegisterOffset(Register reg)
         {
             if (reg.Type == RegisterType.Integer)
@@ -282,6 +285,11 @@ namespace ARMeilleure.State
             return StorageOffset(ref _dummyStorage, ref _dummyStorage.DebugPrecisePc);
         }
 
+        public static int GetCallDepthOffset()
+        {
+            return StorageOffset(ref _dummyStorage, ref _dummyStorage.CallDepth);
+        }
+
         private static int StorageOffset<T>(ref NativeCtxStorage storage, ref T target)
         {
             return (int)Unsafe.ByteOffset(ref Unsafe.As<NativeCtxStorage, T>(ref storage), ref target);