RFR (XXS) 8168438: Fix comment in rewriter

[Jiangli Zhou]

Looks good.

Thanks,
Jiangli

> On Apr 4, 2017, at 5:31 PM, coleen.phillimore at oracle.com wrote:
> 
> A wrong, misleading comment was left in the code. See bug for details.
> 
> open webrev at http://cr.openjdk.java.net/~coleenp/8168438/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8168438
> 
> Tested in build.
> thanks,
> Coleen