Verification has served its purpose now that kRootRegister is fully
supported on ia32.

Bug: v8:6666
Change-Id: I037617bf900f161c221228107c9f1352d4815d87
Reviewed-on: https://chromium-review.googlesource.com/c/1296130Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57666}