Revert of [SAB] Move Atomics builtins to C++

Revert of [SAB] Move Atomics builtins to C++ (patchset #10 id:170001 of https://codereview.chromium.org/2698813004/ )

Reason for revert:
Seems to the culprit in
BUG=chromium:695653
Original issue's description:
> [SAB] Move Atomics builtins to C++
> 
> This patch refactors the Atomics builtins so that they are implemented
> as C++ builtins rather than experimental JS builtins. Previously, each
> of these functions called out to a runtime function, so no significant
> change in performance is anticipated. The goal of this patch is to
> remove the last user of experimental JS builtins so that the mechanism
> can be removed, for performance reasons. The patch includes a drive-by
> fix of a check-fail. For the most part, the patch is just moving code
> without modification from runtime-atomics.cc to
> builtins-sharedarraybuffer.cc .
> 
> BUG=v8:5880
> 
> Review-Url: https://codereview.chromium.org/2698813004
> Cr-Commit-Position: refs/heads/master@{#43335}
> Committed: https://chromium.googlesource.com/v8/v8/+/2b9840d86f3b51f42918b6bf1a06ff8b62b2464d

TBR=binji@chromium.org,littledan@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=v8:5880

[Michael Hablich, 2017-02-27 18:54:47]

The CQ bit was checked by hablich@chromium.org

[Michael Hablich, 2017-02-27 18:54:47]

Created Revert of [SAB] Move Atomics builtins to C++

[commit-bot: I haz the power, 2017-02-27 18:54:59]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-02-27 18:56:08]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-02-27 18:56:09]

Try jobs failed on following builders:
  v8_linux64_gyp_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_gyp_rel_ng/build...)
  v8_linux64_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_rel_ng/builds/21706)
  v8_linux64_verify_csa_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_verify_csa_rel_n...)
  v8_mac_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel_ng/builds/18179)

[Michael Hablich, 2017-02-27 19:09:07]

meh, of course it does not apply cleanly anymore.