RFR (S): 8231189: Rename worker_i parameters to worker_id

[Kim Barrett]

> On Sep 18, 2019, at 11:51 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
> 
> Hi all,
> 
>  can I have reviews for this change that renames all remaining "worker_i"s to "worker_id"s?
> 
> In the jdk9 timeframe we did quite a few renamings of similarly used variables to "worker_id", but either some "worker_i" crept in or were forgotten.
> 
> This rectifies this.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8231189
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8231189/webrev/
> Testing:
> Local compilation
> 
> (Patch based on JDK-8159984 also out for review)
> 
> Thanks,
>  Thomas

Looks good, and trivial.