All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=797045

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=be6fb891950ba8ffca2c4059aede4faebdf78485543232299d65c234809d4f1b


Bot(s) for this bug's original alert(s):

android-webview-nexus5X
chromium-rel-win10

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/120a6e2e040000

📍 Found a significant difference after 1 commit.
https://pinpoint-dot-chromeperf.appspot.com/job/120a6e2e040000

Leave spaces between instance types.
By yangguo@chromium.org · Wed Dec 20 07:34:39 2017
v8 @ 9c6bc7afc0f8a62e24df92d72e41f2f9d590e023

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

 Issue 797072  has been merged into this issue.

 Issue 797038  has been merged into this issue.

 Issue 797111  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/v8/v8.git/+/a7c85f33c14321324301b645507ea90a3322c167

commit a7c85f33c14321324301b645507ea90a3322c167
Author: Yang Guo <yangguo@chromium.org>
Date: Fri Dec 22 08:58:47 2017

Remove unused statistic collection code.

Bug:  chromium:797045 
Change-Id: I21171f72c2989819bbc2f22ca9349fd972176095
Reviewed-on: https://chromium-review.googlesource.com/842482
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50290}
[modify] https://crrev.com/a7c85f33c14321324301b645507ea90a3322c167/src/heap/heap.h
[modify] https://crrev.com/a7c85f33c14321324301b645507ea90a3322c167/src/heap/spaces.cc
[modify] https://crrev.com/a7c85f33c14321324301b645507ea90a3322c167/src/heap/spaces.h
[modify] https://crrev.com/a7c85f33c14321324301b645507ea90a3322c167/src/isolate.cc
[modify] https://crrev.com/a7c85f33c14321324301b645507ea90a3322c167/src/isolate.h

yangguo: I spot-checked the graphs, they appear to go down at the CL in #7. Marking Fixed, please re-open if I'm mistaken.