Correctify instanceof and make it optimizable.

src/arm64/interface-descriptors-arm64.cc

Index: src/arm64/interface-descriptors-arm64.cc
diff --git a/src/arm64/interface-descriptors-arm64.cc b/src/arm64/interface-descriptors-arm64.cc
index b49b457124b09f774ad9120fe25ac56840f58b80..d1a1316cb345fb92e01b7e7a1d0b59a0d51f9332 100644
--- a/src/arm64/interface-descriptors-arm64.cc
+++ b/src/arm64/interface-descriptors-arm64.cc
@@ -41,16 +41,8 @@ const Register StoreGlobalViaContextDescriptor::SlotRegister() { return x2; }
 const Register StoreGlobalViaContextDescriptor::ValueRegister() { return x0; }
 
 
-const Register InstanceofDescriptor::left() {
-  // Object to check (instanceof lhs).
-  return x11;
-}
-
-
-const Register InstanceofDescriptor::right() {
-  // Constructor function (instanceof rhs).
-  return x10;
-}
+const Register InstanceOfDescriptor::LeftRegister() { return x1; }
+const Register InstanceOfDescriptor::RightRegister() { return x0; }
 
 
 const Register ArgumentsAccessReadDescriptor::index() { return x1; }