RFR: 8257708: Remove redundant unmodifiableSet wrapper from already immutable set returned by Collections.singleton

[Aleksey Shipilev]

On Sun, 29 Nov 2020 18:03:24 GMT, Andrey Turbanov <github.com+741251+turbanoff at openjdk.org> wrote:

> 8257708: Remove redundant unmodifiableSet wrapper from already immutable set returned by Collections.singleton

Looks good now!

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1505