The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/021ed349470fbaa3979898c2d8680ab67f7d35b3

commit 021ed349470fbaa3979898c2d8680ab67f7d35b3
Author: Ting-Yuan Huang <laszio@chromium.org>
Date: Tue Dec 20 23:55:20 2016

telemetry_AFDOGenerate: collect perf.data with images by clang

The code layout can be quite different by gcc and clang/llvm. To
make most of afdo, feedback file used by clang needs to be collected
on images built by llvm.

BUG= chromium:676173 
TEST=Run and check files on gs

Change-Id: I0fc385b0f1914367ed2e9f4a24273e729ded3310
Reviewed-on: https://chromium-review.googlesource.com/422540
Commit-Ready: Ting-Yuan Huang <laszio@chromium.org>
Tested-by: Ting-Yuan Huang <laszio@chromium.org>
Reviewed-by: Yunlian Jiang <yunlian@chromium.org>

[modify] https://crrev.com/021ed349470fbaa3979898c2d8680ab67f7d35b3/server/site_tests/telemetry_AFDOGenerate/telemetry_AFDOGenerate.py

Closing. Please reopen it if its not fixed. Thanks!