[8u] RFR (S) 8151539: Remove duplicate AlwaysTrueClosures

[Stefan Karlsson]

Backport looks good.

StefanK

On 2019-04-30 18:21, Aleksey Shipilev wrote:
> Original RFE:
>    https://bugs.openjdk.java.net/browse/JDK-8151539
>
> Original fix:
>    http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/be3ffb6d8eb0
>
> I would like to backport this cleanup to 8u, because it unblocks the Shenandoah backport in
> downstream repository. Patch does not apply cleanly, because reshuffles are needed, and then some
> near code is not matching the version from 9 (mostly due to Unified Logging).
>
> 8u webrev:
>    http://cr.openjdk.java.net/~shade/8151539/webrev.8u.01/
>
> Testing: Linux x86_64 {fastdebug,release} builds; all hotspot jtregs
>