Enable stub generation using Hydrogen/Lithium (again)

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index 970571840b5cd49a3ec99859a62cfb860c5616aa..2c39a0c80776e04ca4d7b8e273a7daa624723b5d 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -36,6 +36,24 @@
 namespace v8 {
 namespace internal {
 
+
+CodeStubInterfaceDescriptor*
+    KeyedLoadFastElementStub::GetInterfaceDescriptor(Isolate* isolate) {
+  static CodeStubInterfaceDescriptor* result = NULL;
+  if (result == NULL) {
+    Handle<Code> miss = isolate->builtins()->KeyedLoadIC_Miss();
+    static Register registers[] = { rdx, rax };
+    static CodeStubInterfaceDescriptor info = {
+      2,
+      registers,
+      miss
+    };
+    result = &info;
+  }
+  return result;
+}
+
+
 #define __ ACCESS_MASM(masm)
 
 void ToNumberStub::Generate(MacroAssembler* masm) {