RFR: Fix fullgc assertion

[William Kemper]

On Fri, 13 Jan 2023 16:28:03 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

> Relax generation sizing assertions during Full GC because of the sequencing of operations that occur during Full GC.
> 
> Enforce the assertion constraints at the end of Full GC.

Marked as reviewed by wkemper (Committer).

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PR: https://git.openjdk.org/shenandoah/pull/200