powerpc: Improve comment explaining why we modify VRSAVE

[Michael Ellerman]

On Thu, 2016-19-05 at 18:41:34 UTC, Unknown sender due to SPF wrote:
> The comment explaining why we modify VRSAVE is misleading, glibc
> does rely on the behaviour. Update the comment.
> 
> Signed-off-by: Anton Blanchard <anton at samba.org>
> Reviewed-by: Cyril Bur <cyrilbur at gmail.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/dd57023747e33572b31867f890

cheers