Turn the load field code stub into a hydrogen code stub.

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 aba2a3835555f379ca5eb5b7ce9b011604e4c594..ec6665bd48c63be6e7884594ad26ce0eb6004ed1 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -75,6 +75,28 @@ void KeyedLoadFastElementStub::InitializeInterfaceDescriptor(
 }
 
 
+void LoadFieldStub::InitializeInterfaceDescriptor(
+    Isolate* isolate,
+    CodeStubInterfaceDescriptor* descriptor) {
+  static Register registers[] = { rax };
+  descriptor->register_param_count_ = 1;
+  descriptor->register_params_ = registers;
+  descriptor->stack_parameter_count_ = NULL;
+  descriptor->deoptimization_handler_ = NULL;
+}
+
+
+void KeyedLoadFieldStub::InitializeInterfaceDescriptor(
+    Isolate* isolate,
+    CodeStubInterfaceDescriptor* descriptor) {
+  static Register registers[] = { rdx };
+  descriptor->register_param_count_ = 1;
+  descriptor->register_params_ = registers;
+  descriptor->stack_parameter_count_ = NULL;
+  descriptor->deoptimization_handler_ = NULL;
+}
+
+
 void KeyedStoreFastElementStub::InitializeInterfaceDescriptor(
     Isolate* isolate,
     CodeStubInterfaceDescriptor* descriptor) {
@@ -2392,12 +2414,6 @@ void StoreArrayLengthStub::Generate(MacroAssembler* masm) {
 }
 
 
-void LoadFieldStub::Generate(MacroAssembler* masm) {
-  StubCompiler::DoGenerateFastPropertyLoad(masm, rax, reg_, inobject_, index_);
-  __ ret(0);
-}
-
-
 void ArgumentsAccessStub::GenerateReadElement(MacroAssembler* masm) {
   // The key is in rdx and the parameter count is in rax.