Suppress some warings in the tests.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@131326 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/containers/Emplaceable.h b/test/containers/Emplaceable.h
index 59ccc66..aab290a 100644
--- a/test/containers/Emplaceable.h
+++ b/test/containers/Emplaceable.h
@@ -24,7 +24,7 @@
     bool operator==(const Emplaceable& x) const
         {return int_ == x.int_ && double_ == x.double_;}
     bool operator<(const Emplaceable& x) const
-        {return int_ < x.int_ || int_ == x.int_ && double_ < x.double_;}
+        {return int_ < x.int_ || (int_ == x.int_ && double_ < x.double_);}
 
     int get() const {return int_;}
 };