Use state of mark context itself to track stability of old mark bitmap

[earthling-amzn]

Rely on the state of the bitmap itself, rather than the state of the GC for knowing when it is safe to use the old generation bitmap.

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Progress

• Change must not contain extraneous whitespace
• Change must be properly reviewed (1 review required, with at least 1 Committer)

Reviewers

• Y. Srinivas Ramakrishna (@ysramakrishna - Author)
• Aleksey Shipilev (@shipilev - Committer)

Reviewing

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$ git fetch https://git.openjdk.org/shenandoah.git pull/266/head:pull/266
$ git checkout pull/266

Update a local copy of the PR:
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$ git pr checkout 266

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[openjdk]

@earthling-amzn This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

Use state of mark context itself to track stability of old mark bitmap

Reviewed-by: ysr, shade

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[earthling-amzn]

/integrate

[openjdk]

Going to push as commit d59effc.

[openjdk]

@earthling-amzn Pushed as commit d59effc.

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