Add over allocated memory of fixed array sub types to fixed array type.

src/heap/object-stats.h

Index: src/heap/object-stats.h
diff --git a/src/heap/object-stats.h b/src/heap/object-stats.h
index add5a12b0439e451a4307e6a4f9e7e48d29e16f6..6c35425bfe11b7eaeb723c7408124887bca1ffcc 100644
--- a/src/heap/object-stats.h
+++ b/src/heap/object-stats.h
@@ -75,6 +75,9 @@ class ObjectStats {
           over_allocated;
       over_allocated_histogram_[FIRST_FIXED_ARRAY_SUB_TYPE + array_sub_type]
                                [HistogramIndexFromSize(over_allocated)]++;
+      over_allocated_[InstanceType::FIXED_ARRAY_TYPE] += over_allocated;
+      over_allocated_histogram_[InstanceType::FIXED_ARRAY_TYPE]
+                               [HistogramIndexFromSize(over_allocated)]++;
     }
     return true;
   }