libstdc++: [_Hashtable] Optimize destructor

Hashtable destructor do not need to call clear() method that in addition to
destroying all nodes also reset all buckets to nullptr.

libstdc++-v3/ChangeLog:

	* include/bits/hashtable.h (~_Hashtable()): Replace clear call with
	a _M_deallocate_nodes call.

diff --git a/libstdc++-v3/include/bits/hashtable.h b/libstdc++-v3/include/bits/hashtable.h
index cd3e1ac297c5c153b5f533c35d4741ff3dec479e..6e78cb7d9c09e4611d02f49bf697e2b1fdfac9e0 100644 (file)
--- a/libstdc++-v3/include/bits/hashtable.h
+++ b/libstdc++-v3/include/bits/hashtable.h
@@ -1664,7 +1664,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
                    "Cache the hash code or qualify your functors involved"
                    " in hash code and bucket index computation with noexcept");
 
-      clear();
+      this->_M_deallocate_nodes(_M_begin());
       _M_deallocate_buckets();
     }