Fix tests that fail when built with different options

	* testsuite/20_util/duration/cons/2.cc: Add -ffloat-store to fix
	failure when compiled without optimisation.
	* testsuite/ext/profile/mutex_extensions_neg.cc: Prune additional
	errors caused by C++17 std::pmr alias templates.

From-SVN: r265287

libstdc++-v3/ChangeLog

 2018-10-18  Jonathan Wakely  <jwakely@redhat.com>
 
+	* testsuite/20_util/duration/cons/2.cc: Add -ffloat-store to fix
+	failure when compiled without optimisation.
+	* testsuite/ext/profile/mutex_extensions_neg.cc: Prune additional
+	errors caused by C++17 std::pmr alias templates.
+
 	PR libstdc++/87642
 	* config/locale/gnu/monetary_members.cc
 	(moneypunct<char, true>::_M_initialize_moneypunct): Use

libstdc++-v3/testsuite/20_util/duration/cons/2.cc

 // { dg-do run { target c++11 } }
+// { dg-additional-options "-ffloat-store" { target { m68*-*-* || ia32 } } }
 
 // Copyright (C) 2008-2018 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/ext/profile/mutex_extensions_neg.cc

@@ -29,3 +29,5 @@
 
 // "template argument 1 is invalid"
 // { dg-prune-output "tuple:993" }
+// PMR alias templates cause ambiguities between debug and profile containers:
+// { dg-prune-output "is ambiguous" }