libstdc++: Fix outdated comment in <stacktrace>

My r15-998-g2a83084ce55363 change replaced the use of nothrow
operator new with a call to __get_temporary_buffer, so update the
comment to match.

libstdc++-v3/ChangeLog:

	* include/std/stacktrace (_Impl::_M_allocate): Fix outdated
	comment.

diff --git a/libstdc++-v3/include/std/stacktrace b/libstdc++-v3/include/std/stacktrace
index f94a424e4cff679daf29c8656d027e122ecf7276..491122293c5f094426a963b2c3a45b53108e9ba9 100644 (file)
--- a/libstdc++-v3/include/std/stacktrace
+++ b/libstdc++-v3/include/std/stacktrace
@@ -559,7 +559,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
            {
              if constexpr (is_same_v<allocator_type, allocator<value_type>>)
                {
-                 // For std::allocator we use nothrow-new directly so we
+                 // Use non-throwing __get_temporary_buffer, so that we
                  // don't need to handle exceptions from __alloc.allocate(n).
                  auto __p = __detail::__get_temporary_buffer<value_type>(__n);
                  if (__p == nullptr) [[unlikely]]