fix for arm64

Author: VSadov

src/coreclr/vm/arm64/stubs.cpp

@@ -772,7 +772,7 @@ void HijackFrame::UpdateRegDisplay_Impl(const PREGDISPLAY pRD, bool updateFloats
 
      pRD->volatileCurrContextPointers.X0 = &m_Args->X0;
      pRD->volatileCurrContextPointers.X1 = &m_Args->X1;
-     pRD->volatileCurrContextPointers.X1 = &m_Args->X2;
+     pRD->volatileCurrContextPointers.X2 = &m_Args->X2;
 
      pRD->pCurrentContext->X19 = m_Args->X19;
      pRD->pCurrentContext->X20 = m_Args->X20;