Review request for JDK-8134502: introduce abstraction for basic NodeVisitor usage

[Attila Szegedi]

Thanks for the review folks; can I quickly get a review for the 8u-dev backport at <http://cr.openjdk.java.net/~attila/8134502/webrev.jdk8u-dev>? 

The changes from jdk9 are:
- Parser API changes are omitted
- RecompilableScriptFunctionData.java Hunk #2 failed to apply solely because its context is different ("IdentityHashMap<Symbol, Boolean>” in 8 vs. "IdentityHashMap<>" in 9 on the line preceding the change).

Thanks,
  Attila.

> On Sep 27, 2015, at 12:05 PM, Marcus Lagergren <marcus at lagergren.net> wrote:
> 
> +1
> 
>> On 25 Sep 2015, at 18:54, Attila Szegedi <attila.szegedi at oracle.com> wrote:
>> 
>> Please review JDK-8134502 "introduce abstraction for basic NodeVisitor usage" at <http://cr.openjdk.java.net/~attila/8134502/webrev.jdk9> for <https://bugs.openjdk.java.net/browse/JDK-8134502>
>> 
>> Thanks,
>> Attila.
>