[tools] Support pointer compression in windbg.js

Change-Id: I63cf6cd9b22ea02846ec40eba214acb21304d418
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1832637
Commit-Queue: Irina Yatsenko <irinayat@microsoft.com>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64091}