RFR: Fix preempt old preparation

[William Kemper]

On Fri, 29 Oct 2021 21:35:14 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

> To address crashes found following integration of "preempt old preparation", several fixes have been implemented:
> 
> 1. Defer mixed evacuations until after coalesce-and-fill is done
> 2. Fix verification of remembered set to use the marking context whenever old-gen is in the process of preparing for mixed evacuations.
> 3. Cosmetic improvement to change "misleading" function names.

Looks good to me.

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Marked as reviewed by wkemper (Committer).

PR: https://git.openjdk.java.net/shenandoah/pull/96