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

@@ -88,10 +88,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	__gnu_cxx::__numeric_traits<ptrdiff_t>::__max / sizeof(_Tp);
       if (__len > __max)
 	__len = __max;
-      
-      while (__len > 0) 
+
+      while (__len > 0)
 	{
-	  _Tp* __tmp = static_cast<_Tp*>(::operator new(__len * sizeof(_Tp), 
+	  _Tp* __tmp = static_cast<_Tp*>(::operator new(__len * sizeof(_Tp),
 							std::nothrow));
 	  if (__tmp != 0)
 	    return std::pair<_Tp*, ptrdiff_t>(__tmp, __len);
@@ -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); }
 
 
   /**