Add missing <cassert> include to testcase

	* testsuite/util/performance/priority_queue/mem_usage/pop_test.hpp:
	Include <cassert> header.

From-SVN: r244176

libstdc++-v3/ChangeLog

 2017-01-06  Jonathan Wakely  <jwakely@redhat.com>
 
+	* testsuite/util/performance/priority_queue/mem_usage/pop_test.hpp:
+	Include <cassert> header.
+
 	PR libstdc++/78968
 	* crossconfig.m4: Check for __cxa_thread_atexit on *-*-freebsd*.
 	* configure: Regenerate.

libstdc++-v3/testsuite/util/performance/priority_queue/mem_usage/pop_test.hpp

@@ -42,6 +42,7 @@
 #include <ext/pb_ds/detail/type_utils.hpp>
 #include <performance/io/xml_formatter.hpp>
 #include <common_type/priority_queue/string_form.hpp>
+#include <cassert>
 
 namespace __gnu_pbds
 {