Roll silvermont AFDO profile from 81-3987.0-1576497268-benchmark-81.0…

….3995.0-r1 to 81-3987.0-1576497268-benchmark-81.0.4001.0-r1

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/cros-afdo-silvermont-chromium
Please CC c-compiler-chrome@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Tbr: c-compiler-chrome@google.com
Change-Id: Icee99a50abbaaa67cbe705c4cbef81c844452697
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1979451
Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#727042}

chromeos/profiles/silvermont.afdo.newest.txt

@@ -1 +1 @@
-chromeos-chrome-amd64-silvermont-81-3987.0-1576497268-benchmark-81.0.3995.0-r1-redacted.afdo.xz
+chromeos-chrome-amd64-silvermont-81-3987.0-1576497268-benchmark-81.0.4001.0-r1-redacted.afdo.xz