Fix clang++ warnings on -Wtautological-constant-out-of-range-compare

src/elements.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ELEMENTS_H_
 #define V8_ELEMENTS_H_
 
 #include "src/elements-kind.h"
 #include "src/heap/heap.h"
 #include "src/isolate.h"
@@ skipping 161 matching lines @@
 
   MUST_USE_RESULT inline MaybeHandle<FixedArray> AddElementsToFixedArray(
       Handle<Object> receiver, Handle<JSObject> holder, Handle<FixedArray> to,
       FixedArray::KeyFilter filter) {
     return AddElementsToFixedArray(receiver, holder, to,
                                    handle(holder->elements()), filter);
   }
 
   // Returns a shared ElementsAccessor for the specified ElementsKind.
   static ElementsAccessor* ForKind(ElementsKind elements_kind) {
-    DCHECK(elements_kind < kElementsKindCount);
+    DCHECK(static_cast<int>(elements_kind) < kElementsKindCount);
     return elements_accessors_[elements_kind];
   }
 
   static ElementsAccessor* ForArray(Handle<FixedArrayBase> array);
 
   static void InitializeOncePerProcess();
   static void TearDown();
 
  protected:
   friend class SloppyArgumentsElementsAccessor;
@@ skipping 21 matching lines @@
 void CheckArrayAbuse(Handle<JSObject> obj, const char* op, uint32_t key,
                      bool allow_appending = false);
 
 MUST_USE_RESULT MaybeHandle<Object> ArrayConstructInitializeElements(
     Handle<JSArray> array,
     Arguments* args);
 
 } }  // namespace v8::internal
 
 #endif  // V8_ELEMENTS_H_