[stubs] Enable graph verification for builtins.

src/builtins/builtins-internal.cc

 // Copyright 2016 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.
 
 #include "src/builtins/builtins-utils.h"
 #include "src/builtins/builtins.h"
 #include "src/code-stub-assembler.h"
 #include "src/interface-descriptors.h"
 #include "src/macro-assembler.h"
 
@@ skipping 49 matching lines @@
   typedef compiler::Node Node;
   typedef CopyFastSmiOrObjectElementsDescriptor Descriptor;
   CodeStubAssembler assembler(state);
 
   Node* object = assembler.Parameter(Descriptor::kObject);
 
   // Load the {object}s elements.
   Node* source = assembler.LoadObjectField(object, JSObject::kElementsOffset);
 
   CodeStubAssembler::ParameterMode mode = assembler.OptimalParameterMode();
-  Node* length = assembler.UntagParameter(
+  Node* length = assembler.TaggedToParameter(
       assembler.LoadFixedArrayBaseLength(source), mode);
 
   // Check if we can allocate in new space.
   ElementsKind kind = FAST_ELEMENTS;
   int max_elements = FixedArrayBase::GetMaxLengthForNewSpaceAllocation(kind);
   Label if_newspace(&assembler), if_oldspace(&assembler);
   assembler.Branch(
       assembler.UintPtrOrSmiLessThan(
           length, assembler.IntPtrOrSmiConstant(max_elements, mode), mode),
       &if_newspace, &if_oldspace);
@@ skipping 225 matching lines @@
   // Allocate the actual FixedArray for the elements.
   Generate_NewArgumentsElements(&assembler, frame, length);
 
   // No rest parameters, return an empty FixedArray.
   assembler.Bind(&if_empty);
   assembler.Return(assembler.EmptyFixedArrayConstant());
 }
 
 }  // namespace internal
 }  // namespace v8