PR libstdc++/86954 use non-placement operator delete

As explained in the PR, there's no reason to call the nothrow delete,
we can just use the normal one.

	PR libstdc++/86954
	* include/bits/stl_tempbuf.h (return_temporary_buffer): Use
	non-placement delete.

From-SVN: r263542

libstdc++-v3/ChangeLog

 2018-08-14  Jonathan Wakely  <jwakely@redhat.com>
 
+	PR libstdc++/86954
+	* include/bits/stl_tempbuf.h (return_temporary_buffer): Use
+	non-placement delete.
+
 	* include/std/chrono (__check_overflow): Simplify definition.
 	(_Checked_integral_constant): Remove.
 

libstdc++-v3/include/bits/stl_tempbuf.h

@@ -110,7 +110,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Tp>
     inline void
     return_temporary_buffer(_Tp* __p)
-    { ::operator delete(__p, std::nothrow); }
+    { ::operator delete(__p); }
 
 
   /**