This reverts commit fad1c1c9.

Reason for revert: Debug printing not needed anymore.

Original change's description:
> [test] Be more chatty when killing hanging tests
> 
> Bug: v8:8292
> Change-Id: I74fd304692e90adfb694b73ecf5e7858e3b66607
> Reviewed-on: https://chromium-review.googlesource.com/c/1275814
> Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
> Reviewed-by: Maya Lekova <mslekova@chromium.org>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#56562}

TBR=machenbach@chromium.org,sergiyb@chromium.org,mslekova@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: v8:8292
Change-Id: Ieaba51f866b93d49fe168b6370bd126752993afb
Reviewed-on: https://chromium-review.googlesource.com/c/1288632Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56774}