RFR: Padding used for alignment must fit an object

[Roman Kennke]

On Wed, 10 Nov 2021 19:09:52 GMT, William Kemper <wkemper at openjdk.org> wrote:

> In some cases, alignment of new plabs on card boundaries may create padding which is too small to fill with an object. When this case is detected, we align on the plab on the next card boundary.

Marked as reviewed by rkennke (Lead).

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PR: https://git.openjdk.java.net/shenandoah/pull/97