A64: Remove A64 special casing in ExternalCallbackScope

src/a64/simulator-a64.h

Index: src/a64/simulator-a64.h
diff --git a/src/a64/simulator-a64.h b/src/a64/simulator-a64.h
index 4cb3761fe9213e21eb366f14cf07dfe5cd44d322..6279677ca8565e46f32d4ce8caafed06a3d6b1b7 100644
--- a/src/a64/simulator-a64.h
+++ b/src/a64/simulator-a64.h
@@ -445,6 +445,8 @@ class Simulator : public DecoderVisitor {
   }
   Instruction* lr() { return reg<Instruction*>(kLinkRegCode); }
 
+  Address get_sp() { return reinterpret_cast<Address>(sp()); }

[Rodolph Perfetta, 2014/02/12 01:08:51]

Late DBC, on a64 you can avoid the cast:

  Address get_sp() { return reg<Address>(31, Reg31IsStackPointer); }

+
   // Return 'size' bits of the value of a floating-point register, as the
   // specified type. The value is zero-extended to fill the result.
   //