A64: Remove A64 special casing in ExternalCallbackScope

src/arm/simulator-arm.h

Index: src/arm/simulator-arm.h
diff --git a/src/arm/simulator-arm.h b/src/arm/simulator-arm.h
index 0af5162e9380e1beafe512948129c62cb1d91443..24d7fe58c44590f3732ddeb376795089f2721bb0 100644
--- a/src/arm/simulator-arm.h
+++ b/src/arm/simulator-arm.h
@@ -207,6 +207,10 @@ class Simulator {
   void set_pc(int32_t value);
   int32_t get_pc() const;
 
+  Address get_sp() {
+    return reinterpret_cast<Address>(static_cast<intptr_t>(get_register(sp)));
+  }
+
   // Accessor to the internal simulator stack area.
   uintptr_t StackLimit() const;