RFR: 8255990: Bitmap region of dynamic CDS archive is not unmapped

[Ioi Lam]

On Tue, 10 Nov 2020 23:25:11 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

> Add the missing call to `unmap_region` to unmap the bitmap region of a dynamic CDS archive.
> 
> Also modify the `DynamicArchiveRelocationTest` to check for the "Unmapping region" message.
> 
> Testing:
> 
> - [x] tier1
> - tiers 2,3,4 (in progress)

LGTM

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Marked as reviewed by iklam (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1151