Distinguish slow from fast sloppy arguments

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 1e40ac5d9c12f6b253f75530812d4f4bc41573ea..e4664c53a55528486518f7f50f0cacd9a913cfc8 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -6220,7 +6220,7 @@ ElementsKind JSObject::GetElementsKind() {
             fixed_array->IsFixedArray() &&
             fixed_array->IsDictionary()) ||
            (kind > DICTIONARY_ELEMENTS));
-    DCHECK((kind != SLOPPY_ARGUMENTS_ELEMENTS) ||
+    DCHECK(!IsSloppyArgumentsElements(kind) ||
            (elements()->IsFixedArray() && elements()->length() >= 2));
   }
 #endif
@@ -6263,8 +6263,18 @@ bool JSObject::HasDictionaryElements() {
 }
 
 
+bool JSObject::HasFastArgumentsElements() {
+  return GetElementsKind() == FAST_SLOPPY_ARGUMENTS_ELEMENTS;
+}
+
+
+bool JSObject::HasSlowArgumentsElements() {
+  return GetElementsKind() == SLOW_SLOPPY_ARGUMENTS_ELEMENTS;
+}
+
+
 bool JSObject::HasSloppyArgumentsElements() {
-  return GetElementsKind() == SLOPPY_ARGUMENTS_ELEMENTS;
+  return IsSloppyArgumentsElements(GetElementsKind());
 }