powerpc: Improve comment explaining why we modify VRSAVE
The comment explaining why we modify VRSAVE is misleading, glibc does rely on the behaviour. Update the comment. Signed-off-by: NAnton Blanchard <anton@samba.org> Reviewed-by: NCyril Bur <cyrilbur@gmail.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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