Merge GlobalObject with JSGlobalObject.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 17220c6db77594ec556943b06a629eb8e0b8600a..99fa337e3b2edf4faedc3e66a7ac4f64a5c68e8c 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -573,10 +573,6 @@ void JSGlobalObject::JSGlobalObjectVerify() {
     return;
   }
   JSObjectVerify();
-  for (int i = GlobalObject::kHeaderSize; i < JSGlobalObject::kSize;
-       i += kPointerSize) {
-    VerifyObjectField(i);
-  }
 }
 
 
@@ -1038,7 +1034,7 @@ void JSObject::IncrementSpillStatistics(SpillInformation* info) {
     info->number_of_objects_with_fast_properties_++;
     info->number_of_fast_used_fields_   += map()->NextFreePropertyIndex();
     info->number_of_fast_unused_fields_ += map()->unused_property_fields();
-  } else if (IsGlobalObject()) {
+  } else if (IsJSGlobalObject()) {
     GlobalDictionary* dict = global_dictionary();
     info->number_of_slow_used_properties_ += dict->NumberOfElements();
     info->number_of_slow_unused_properties_ +=