Backport request for JDK-8059321

[Marcus Lagergren]

And the webrev is here: 

http://cr.openjdk.java.net/~lagergren/8059321.4/

/M

On 29 Sep 2014, at 14:45, Marcus Lagergren <marcus.lagergren at oracle.com> wrote:

> The introduction of optimistic types in 8u40 led to numerous performance regressions in startup, because of repeated computations of types and regexp syntax validation.
> 
> Bug was reviewed and put into 9, thread is here: http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-September/003544.html
> JIRA entry: https://bugs.openjdk.java.net/browse/JDK-8059321
> 
> /M
>