All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=721078

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgyqHvvgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgyt755wsM


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

android-webview-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8979945053284262976

=== BISECT JOB RESULTS ===
Bisect was unable to run to completion

Please try rerunning the bisect.


If failures persist contact the team (see below) and report the error.


Bisect Details
  Configuration: android_webview_nexus6_aosp_perf_bisect
  Benchmark    : blink_perf.bindings
  Metric       : first-child/first-child
  Change       : 11.77% | 247.942455038 -> 218.770181717

Revision                           Result                  N
chromium@470448                    247.942 +- 1.95836      6      good
chromium@470469                    245.291 +- 7.64999      6      good
chromium@470480                    247.541 +- 1.41747      6      good
chromium@470483                    248.065 +- 1.32874      6      good
chromium@470484                    246.292 +- 6.52952      6      good
chromium@470484,v8@fd749344bf      216.752 +- 16.7046      6      bad
chromium@470484,v8@02595c60a3      220.632 +- 1.3927       6      bad
chromium@470484,v8@dd9dbf4dd7      220.377 +- 1.03576      6      bad
chromium@470484,v8@5f98a061ca      220.353 +- 3.08347      6      bad
chromium@470485                    220.488 +- 1.67296      6      bad
chromium@470490                    218.77 +- 9.34745       6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-webview --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests blink_perf.bindings

Debug Info
  https://chromeperf.appspot.com/buildbucket_job_status/8979945053284262976

Is this bisect wrong?
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5341497169281024


| O O | Visit http://www.chromium.org/developers/speed-infra/perf-bug-faq
|  X  | for more information addressing perf regression bugs. For feedback,
| / \ | file a bug with component Speed>Bisection.  Thank you!

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8979763771206993952

=== Auto-CCing suspected CL author rmcilroy@chromium.org ===

Hi rmcilroy@chromium.org, the bisect results pointed to your CL, please take a look at the
results.


=== BISECT JOB RESULTS ===
Perf regression found with culprit

Suspected Commit
  Author : Ross McIlroy
  Commit : fd749344bf8b49edc4b1b31a489ff2eb843af54f
  Date   : Mon May 08 20:57:30 2017
  Subject: Revert "Reland: [TypeFeedbackVector] Store optimized code in the vector"

Bisect Details
  Configuration: android_webview_nexus6_aosp_perf_bisect
  Benchmark    : blink_perf.bindings
  Metric       : first-child/first-child
  Change       : 11.14% | 246.221543343 -> 218.784612815

Revision                           Result                   N
chromium@470448                    246.222 +- 6.52751       6      good
chromium@470469                    246.578 +- 5.77508       6      good
chromium@470480                    247.961 +- 1.35728       6      good
chromium@470483                    248.259 +- 1.01508       6      good
chromium@470484                    246.569 +- 6.08681       5      good
chromium@470484,v8@4f82f1d948      246.058 +- 6.41751       6      good
chromium@470484,v8@fd749344bf      220.43 +- 0.953989       6      bad       <--
chromium@470484,v8@02595c60a3      220.673 +- 1.35905       6      bad
chromium@470484,v8@dd9dbf4dd7      220.541 +- 2.19202       6      bad
chromium@470484,v8@5f98a061ca      220.989 +- 0.619653      6      bad
chromium@470485                    220.28 +- 0.62477        6      bad
chromium@470490                    218.785 +- 5.35032       6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-webview --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests blink_perf.bindings

Debug Info
  https://chromeperf.appspot.com/buildbucket_job_status/8979763771206993952

Is this bisect wrong?
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5341497169281024


| O O | Visit http://www.chromium.org/developers/speed-infra/perf-bug-faq
|  X  | for more information addressing perf regression bugs. For feedback,
| / \ | file a bug with component Speed>Bisection.  Thank you!

I think I know the reason for this, will upload a fix shortly.

The following revision refers to this bug:
  https://chromium.googlesource.com/v8/v8.git/+/663a8ef4706904c766852a0dc2a4acb6e57dbc4a

commit 663a8ef4706904c766852a0dc2a4acb6e57dbc4a
Author: Ross McIlroy <rmcilroy@chromium.org>
Date: Mon May 15 14:35:41 2017

[Compile] Fix test for marked for deopt in CompileLazy builtin.

BUG= chromium:721078 , v8:6246 

Change-Id: I10f20d9cc2c7cabff8a3fba02aff351fcecc0ce2
Reviewed-on: https://chromium-review.googlesource.com/505611
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45304}
[modify] https://crrev.com/663a8ef4706904c766852a0dc2a4acb6e57dbc4a/src/builtins/arm/builtins-arm.cc
[modify] https://crrev.com/663a8ef4706904c766852a0dc2a4acb6e57dbc4a/src/builtins/arm64/builtins-arm64.cc
[modify] https://crrev.com/663a8ef4706904c766852a0dc2a4acb6e57dbc4a/src/builtins/ia32/builtins-ia32.cc
[modify] https://crrev.com/663a8ef4706904c766852a0dc2a4acb6e57dbc4a/src/builtins/mips/builtins-mips.cc
[modify] https://crrev.com/663a8ef4706904c766852a0dc2a4acb6e57dbc4a/src/builtins/mips64/builtins-mips64.cc
[modify] https://crrev.com/663a8ef4706904c766852a0dc2a4acb6e57dbc4a/src/builtins/x64/builtins-x64.cc

Fixed after the roll at r471865