Remove hole handling since holes cannot occur in JSObjects anymore.

src/hydrogen.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 "src/hydrogen.h"
 
 #include <algorithm>
 
 #include "src/v8.h"
 
@@ skipping 5774 matching lines @@
       info->lookup()->IsCacheable() &&
       info->lookup()->IsReadOnly() && info->lookup()->IsDontDelete()) {
     Handle<Object> object(
         HConstant::cast(checked_object->ActualValue())->handle(isolate()));
 
     if (object->IsJSObject()) {
       LookupResult lookup(isolate());
       Handle<JSObject>::cast(object)->Lookup(info->name(), &lookup);
       Handle<Object> value(lookup.GetLazyValue(), isolate());
 
-      if (!value->IsTheHole()) {
-        return New<HConstant>(value);
-      }
+      ASSERT(!value->IsTheHole());
+      return New<HConstant>(value);
     }
   }
 
   HObjectAccess access = info->access();
   if (access.representation().IsDouble()) {
     // Load the heap number.
     checked_object = Add<HLoadNamedField>(
         checked_object, static_cast<HValue*>(NULL),
         access.WithRepresentation(Representation::Tagged()));
     // Load the double value from it.
@@ skipping 6616 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal