Fix inconsistent operator delete usages

[François Dumont]

    I was writing a test which needed to override the std::nothrow 
versions of the operator new and delete to control get_temporary_buffer 
behavior and noticed that it is inconsistent with 
release_temporary_buffer in terms of new/delete operators.

    Grepping for other std::nothrow usages I found some others and 
especially one in libsupc++.

    I don't know how serious it is considering the Standard. As long as 
you stick to the libstdc++ operators it is fine. Only users overriding 
those operators will notice.

    Tested under Linux x86_64 normal mode with some failures but none 
related to this patch I think but of course you better check on your side.

    * libsupc++/atexit_thread.cc (run(void*)): Call std::nothrow delete
    operator.
    * include/bits/stl_tempbuf.h (return_temporary_buffer): Likewise.
    * include/profile/impl/profiler_trace.h
    (__trace_base<>::~__trace_base()): Likewise.
    (__trace_base<>::__add_object(__stack_t)): Likewise.
    (__trace_base<>::__retire_object(__stack_t)): Likewise.

Let me know if it is a go.

François

diff --git a/libstdc++-v3/include/bits/stl_tempbuf.h b/libstdc++-v3/include/bits/stl_tempbuf.h
index b6ad9ee6a46..e614a77bc4f 100644
--- a/libstdc++-v3/include/bits/stl_tempbuf.h
+++ b/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); }
+    { ::operator delete(__p, std::nothrow); }
 
 
   /**
diff --git a/libstdc++-v3/include/profile/impl/profiler_trace.h b/libstdc++-v3/include/profile/impl/profiler_trace.h
index 261f3b3cc72..36822ef77ac 100644
--- a/libstdc++-v3/include/profile/impl/profiler_trace.h
+++ b/libstdc++-v3/include/profile/impl/profiler_trace.h
@@ -200,7 +200,7 @@ namespace __gnu_profile
       {
 	for (typename __stack_table_t::iterator __it
 	       = __stack_table.begin(); __it != __stack_table.end(); ++__it)
-	  delete __it->first;
+	  ::operator delete(__it->first, std::nothrow);
       }
 
       __object_info* __add_object(__stack_t __stack);
@@ -235,14 +235,14 @@ namespace __gnu_profile
 
       if (__max_mem() != 0 && __objects_byte_size >= __max_mem())
 	{
-	  delete __stack;
+	  ::operator delete(__stack, std::nothrow);
 	  return 0;
 	}
 
       __object_info* __ret = new(std::nothrow) __object_info(__stack);
       if (!__ret)
 	{
-	  delete __stack;
+	  ::operator delete(__stack, std::nothrow);
 	  return 0;
 	}
 
@@ -277,16 +277,16 @@ namespace __gnu_profile
 					     __stack_info(__info)));
 	    }
 	  else
-	    delete __stack;
+	    ::operator delete(__stack, std::nothrow);
 	}
       else
 	{
 	  // Merge object info into info summary for this call context.
 	  __stack_it->second.__merge(__info);
-	  delete __stack;
+	  ::operator delete(__stack, std::nothrow);
 	}
 
-      delete __obj_info;
+      ::operator delete(__obj_info, std::nothrow);
       __objects_byte_size -= sizeof(__object_info);
     }
 
diff --git a/libstdc++-v3/libsupc++/atexit_thread.cc b/libstdc++-v3/libsupc++/atexit_thread.cc
index 25334250dab..d47d1654b28 100644
--- a/libstdc++-v3/libsupc++/atexit_thread.cc
+++ b/libstdc++-v3/libsupc++/atexit_thread.cc
@@ -79,7 +79,7 @@ namespace {
 	  FreeLibrary (e->dll);
 #endif
 	e = e->next;
-	delete (old_e);
+	::operator delete(old_e, std::nothrow);
       }
   }