TracingCpuProfiler test updates the current plaform while
concurrent marking is running.

This patch also disables stress-incremental-marking for
mjsunit/regress-430201.

BUG=chromium:694255

Change-Id: I85ff538c47bce0300cde3204989ef3f9512b805f
Reviewed-on: https://chromium-review.googlesource.com/533873Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45921}