RFR: 8253222: Shenandoah: unused AlwaysTrueClosure after JDK-8246591

[Roman Kennke]

On Wed, 16 Sep 2020 08:06:01 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Static analysis shows the AlwaysTrueClosure is not needed in `ShenandoahRootScanner::roots_do` after JDK-8246591.
> 
> Testing: Linux x86_64 tier1_gc_shenandoah

Looks good. Thank you!

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Marked as reviewed by rkennke (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/201