[libstdc++/66359] Backport change 217461 to 4.9 branch?

[Jonathan Wakely]

On 03/06/15 19:46 -0700, Tim Shen wrote:
>(I noticed the archive didn't associate
>https://gcc.gnu.org/ml/libstdc++/2015-06/msg00008.html with previous
>messages, so I'm posting a new one)
>
>Hi,
>
>Half a year ago I made this change:
>https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=217461
>
>Discussion is here: https://gcc.gnu.org/ml/libstdc++/2014-11/msg00045.html
>
>I did asked about backporting this to 4.9 and then forgot about it :)
>
>Is this backport compatible and worth doing (base on my knowledge, yes)?

Yes, this looks safe, OK for the 4.9 branch.