A64: Remove A64 special casing in ExternalCallbackScope

src/mips/simulator-mips.h

Index: src/mips/simulator-mips.h
diff --git a/src/mips/simulator-mips.h b/src/mips/simulator-mips.h
index d9fd10f245c3617e332bfdefeb8b9b3b2a099826..92a0a87d2406e2a2fc83274ae27363b62b3b72a0 100644
--- a/src/mips/simulator-mips.h
+++ b/src/mips/simulator-mips.h
@@ -203,6 +203,10 @@ 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;