Fix a few nits found by PVS Studio

src/objects.cc

 // Copyright 2013 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 <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
@@ skipping 7179 matching lines @@
   bool IsIterating() {
     return (*IteratorField())->IsSmi() &&
            Smi::cast(*IteratorField())->value() < 0;
   }
 
   Map* Next() {
     DCHECK(IsIterating());
     int value = Smi::cast(*IteratorField())->value();
     int index = -value - 1;
     int number_of_transitions = transition_array_->number_of_transitions();
-    while (index < number_of_transitions) {
+    if (index < number_of_transitions) {
       *IteratorField() = Smi::FromInt(value - 1);
       return transition_array_->GetTarget(index);
     }
 
     *IteratorField() = constructor_;
     return NULL;
   }
 
  private:
   Object** IteratorField() {
@@ skipping 9354 matching lines @@
   Handle<DependentCode> codes =
       DependentCode::Insert(handle(cell->dependent_code(), info->isolate()),
                             DependentCode::kPropertyCellChangedGroup,
                             info->object_wrapper());
   if (*codes != cell->dependent_code()) cell->set_dependent_code(*codes);
   info->dependencies(DependentCode::kPropertyCellChangedGroup)->Add(
       cell, info->zone());
 }
 
 } }  // namespace v8::internal