RFR: Remove unnecessary checks identified by reviewer

Fri Jun 24 20:34:21 UTC 2022

On Fri, 24 Jun 2022 19:38:33 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

> A previous pull request was integrated before all of the reviewer
> comments had been addressed.  This commit addresses the lingering
> request.

See https://urldefense.com/v3/__https://github.com/openjdk/shenandoah/pull/145/files/0d8c092e209f61f91ccb41312a028769147d0f4c*r906297895__;Iw!!ACWV5N9M2RV99hQ!N-0T1716i9EqfOK_8XEUg6vDwgr8jX0TXMiWzQrVTBAqyyCpDPsCrDyEXmdYLxZRrj69bkcy6gVL_F6a2bxaat-BJw$ 

for context of original feedback

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PR: https://git.openjdk.org/shenandoah/pull/146