[stubs] Port LoadFieldStub to TF

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index 3fbc8d81e64fd7482cf85e1d992cd2b5e5379aa9..95585a874e20576e1e2963d41bf23830f1d9162f 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -21,6 +21,7 @@ class PlatformInterfaceDescriptor;
   V(ContextOnly)                          \
   V(Load)                                 \
   V(LoadWithVector)                       \
+  V(LoadField)                            \
   V(LoadICProtoArray)                     \
   V(LoadGlobal)                           \
   V(LoadGlobalWithVector)                 \
@@ -308,6 +309,18 @@ class LoadDescriptor : public CallInterfaceDescriptor {
   static const Register SlotRegister();
 };
 
+// LoadFieldDescriptor is used by the shared handler that loads a field from an
+// object based on the smi-encoded field description.
+class LoadFieldDescriptor : public CallInterfaceDescriptor {
+ public:
+  DEFINE_PARAMETERS(kReceiver, kSmiHandler)
+  DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(LoadFieldDescriptor,
+                                               CallInterfaceDescriptor)
+
+  static const Register ReceiverRegister();
+  static const Register SmiHandlerRegister();
+};
+
 class LoadGlobalDescriptor : public CallInterfaceDescriptor {
  public:
   DEFINE_PARAMETERS(kName, kSlot)