diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2801b392057..132a8f926b9 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,13 @@
+2019-03-26  Jason Merrill  <jason@redhat.com>
+	    Jakub Jelinek  <jakub@redhat.com>
+
+	* mem-stats.h (mem_alloc_description::unregister_descriptor): New
+	method.
+	(mem_alloc_description::release_object_overhead): Fix comment typos.
+	* hash-table.h (hash_table::~hash_table): Call
+	release_instance_overhead only if m_entries is non-NULL, otherwise
+	call unregister_descriptor.
+
 2019-03-26  Bin Cheng  <bin.cheng@linux.alibaba.com>
 
 	PR tree-optimization/81740
diff --git a/gcc/hash-table.h b/gcc/hash-table.h
index e5bbe677cec..37e4b83b876 100644
--- a/gcc/hash-table.h
+++ b/gcc/hash-table.h
@@ -652,12 +652,13 @@ hash_table<Descriptor, Lazy, Allocator>::~hash_table ()
 	Allocator <value_type> ::data_free (m_entries);
       else
 	ggc_free (m_entries);
+      if (m_gather_mem_stats)
+	hash_table_usage ().release_instance_overhead (this,
+						       sizeof (value_type)
+						       * m_size, true);
     }
-
-  if (m_gather_mem_stats)
-    hash_table_usage ().release_instance_overhead (this,
-						   sizeof (value_type)
-						   * m_size, true);
+  else if (m_gather_mem_stats)
+    hash_table_usage ().unregister_descriptor (this);
 }
 
 /* This function returns an array of empty hash table elements.  */
diff --git a/gcc/mem-stats.h b/gcc/mem-stats.h
index 7612e7de3d2..63ce8712e2b 100644
--- a/gcc/mem-stats.h
+++ b/gcc/mem-stats.h
@@ -342,9 +342,15 @@ public:
   T *release_instance_overhead (void *ptr, size_t size,
 				bool remove_from_map = false);
 
-  /* Release intance object identified by PTR pointer.  */
+  /* Release instance object identified by PTR pointer.  */
   void release_object_overhead (void *ptr);
 
+  /* Unregister a memory allocation descriptor registered with
+     register_descriptor (remove from reverse map), unless it is
+     unregistered through release_instance_overhead with
+     REMOVE_FROM_MAP = true.  */
+  void unregister_descriptor (void *ptr);
+
   /* Get sum value for ORIGIN type of allocation for the descriptor.  */
   T get_sum (mem_alloc_origin origin);
 
@@ -522,7 +528,7 @@ mem_alloc_description<T>::release_instance_overhead (void *ptr, size_t size,
   return usage;
 }
 
-/* Release intance object identified by PTR pointer.  */
+/* Release instance object identified by PTR pointer.  */
 
 template <class T>
 inline void
@@ -536,6 +542,17 @@ mem_alloc_description<T>::release_object_overhead (void *ptr)
     }
 }
 
+/* Unregister a memory allocation descriptor registered with
+   register_descriptor (remove from reverse map), unless it is
+   unregistered through release_instance_overhead with
+   REMOVE_FROM_MAP = true.  */
+template <class T>
+inline void
+mem_alloc_description<T>::unregister_descriptor (void *ptr)
+{
+  m_reverse_map->remove (ptr);
+}
+
 /* Default contructor.  */
 
 template <class T>