Revert "Create a RegisterSpec class inside of the IC that provides:"

src/ic.h

Index: src/ic.h
diff --git a/src/ic.h b/src/ic.h
index f2a792bc5613d42d01b75dc339a6912c91e97611..3f550438a487849c8931dc6d87f7b51d8b125405 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -398,15 +398,6 @@ class LoadIC: public IC {
   class ContextualModeBits: public BitField<ContextualMode, 0, 1> {};
   STATIC_ASSERT(static_cast<int>(NOT_CONTEXTUAL) == 0);
 
-  enum RegisterInfo {
-    kReceiverIndex,
-    kNameIndex,
-    kRegisterArgumentCount
-  };
-  static Register kReceiverRegister;
-  static Register kNameRegister;
-  static const Register registers[kRegisterArgumentCount];
-
   static ExtraICState ComputeExtraICState(ContextualMode contextual_mode) {
     return ContextualModeBits::encode(contextual_mode);
   }
@@ -507,10 +498,6 @@ class KeyedLoadIC: public LoadIC {
     ASSERT(target()->is_keyed_load_stub());
   }
 
-  static const Register registers[kRegisterArgumentCount];
-  static Register kReceiverRegister;
-  static Register kNameRegister;
-
   MUST_USE_RESULT MaybeHandle<Object> Load(Handle<Object> object,
                                            Handle<Object> key);