PR libstdc++/86676 another alignment fix for test

	PR libstdc++/86676
	* testsuite/20_util/monotonic_buffer_resource/release.cc: Request
	same alignment for post-release allocation.

From-SVN: r262984

libstdc++-v3/ChangeLog

+2018-07-26  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/86676
+	* testsuite/20_util/monotonic_buffer_resource/release.cc: Request
+	same alignment for post-release allocation.
+
 2018-07-25  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/86676

libstdc++-v3/testsuite/20_util/monotonic_buffer_resource/release.cc

@@ -127,7 +127,7 @@ test04()
   VERIFY( mbr.upstream_resource() == &r );
   VERIFY( r.number_of_active_allocations() == 0 );
   // initial buffer should be used again now:
-  p = mbr.allocate(1000);
+  p = mbr.allocate(1000, 16);
   VERIFY( p == p_in_buffer );
   VERIFY( r.allocate_calls == 1 );
 }