PR78326 fix incorrect access of data member in base class

	PR libstdc++/78326
	* include/experimental/memory_resource (memory_resource::_S_max_align):
	Change access to protected.

From-SVN: r242373

libstdc++-v3/ChangeLog

 2016-11-13  Jonathan Wakely  <jwakely@redhat.com>
 
+	PR libstdc++/78326
+	* include/experimental/memory_resource (memory_resource::_S_max_align):
+	Change access to protected.
+
 	* doc/xml/manual/status_cxx2017.xml: Update status.
 	* doc/html/manual/status.html: Regenerate.
 	* include/bits/shared_ptr.h (shared_ptr(unique_ptr<_Yp, _Del>)): Add

libstdc++-v3/include/experimental/memory_resource

@@ -72,6 +72,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   // 8.5 Class memory_resource
   class memory_resource
   {
+  protected:
     static constexpr size_t _S_max_align = alignof(max_align_t);
 
   public: