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 ec97b71175cecccd4572066064d6aef02a0c15da..8adb483222c0723a0e68a7fc52333a568518bc5d 100644
--- a/src/arm64/interface-descriptors-arm64.cc
+++ b/src/arm64/interface-descriptors-arm64.cc
@@ -46,16 +46,8 @@ 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; }