RFR: 8272343: Remove MetaspaceClosure::FLAG_MASK

[Calvin Cheung]

On Wed, 25 Aug 2021 03:59:48 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> Please review this simple fix. `MetaspaceClosure::FLAG_MASK` is no longer needed after https://bugs.openjdk.java.net/browse/JDK-8272107

The cleanup looks good.

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Marked as reviewed by ccheung (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5245