These two calls used Tagged, which may not match the field in question
and thus might leak a MutableHeapNumber.  Since the result was used in a
very limited way, this was not a correctness bug but it should be fixed
anyways.

Bug: chromium:966229
Change-Id: Id237729b60d980ded154f70d03e98375f5edc4cc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1630681
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61878}