Merging 31 commit(s) from Chromium's toolchain-utils

Merged commit digest:
  9b60327 compiler_wrapper: strip march=tremont for gcc
  6c213ea git_llvm_rev: auto-update llvm-project-copy in tests
  f414196 git_llvm_rev: handle merge commits more gracefully
  70e8bc6 afdo_metadata: Publish new profiles for kernel 4.4.
  2841733 toolchain-utils: fix bug in buildbot_test_llvm
  047ce1b afdo_metadata: Publish new profiles for kernel 3.18.
  9a761ff afdo_metadata: Publish new profiles for kernel 3.14.
  45e4c1f toolchain-utils: Migrate cros_utils to python3
  e41baa8 afdo_metadata: Publish new profiles for kernel 4.4.
  7234822 afdo_metadata: Publish new profiles for kernel 3.18.
  03af4d4 afdo_metadata: Publish new profiles for kernel 4.4.
  446f858 afdo_metadata: Publish new profiles for kernel 3.18.
  59f4f17 afdo_metadata: Publish new profiles for kernel 3.14.
  873576b afdo_metadata: Publish new profiles for kernel 4.4.
  0a6caea afdo_metadata: Publish new profiles for kernel 3.18.
  bad241e afdo_metadata: Publish new profiles for kernel 3.14.
  3254cdb afdo_metadata: Publish new profiles for kernel 3.18.
  f6212d3 afdo_metadata: Publish new profiles for kernel 4.4.
  a78dc3d afdo_metadata: Publish new profiles for kernel 3.14.
  bbdc566 crosperf: fix skylab telemetry_Crosperf tests launching command
  2a0bffb toolchain-utils: Correct argument typo when launching Crosperf.
  f4fe66e Crosperf: Do not image DUT in Skylab mode
  5a74f07 crosperf: migrate device setup functions for telemetry_Crosperf
  5ca2cc3 drop COMMIT-QUEUE.ini
  2b69eb3 afdo_metadata: Publish new profiles for kernel 3.18.
  ed2720e llvm_tools: update commit message
  896674c afdo_metadata: Publish new profiles for kernel 3.14.
  3001c16 afdo_metadata: Publish new profiles for kernel 4.4.
  46dacd6 llvm_tools: add git_llvm_rev to the copy/paste list
  2e78deb Remove trailing newline from sha/git hash.
  f07dd6d LLVM tools: sync python scripts

Change-Id: I47f4dda92a857b91629a86622c05cf61366bccf4