RFR: 8260212: Shenandoah: resolve-only UpdateRefsMode is not used

[Roman Kennke]

On Thu, 21 Jan 2021 08:31:36 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> The only "use" is `ShenandoahMarkResolveRefsClosure`, which is unused itself.

Looks good! (Wow, this really goes up in smoke, doesn't it?)

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Marked as reviewed by rkennke (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2177