Revert of Update implementation of atomics with latest Chromium version but use compiler builtin atomics

Revert of Update implementation of atomics with latest Chromium version but use compiler builtin atomics (patchset #10 id:190001 of https://chromiumcodereview.appspot.com/2425963002/ )

Reason for revert:
https://build.chromium.org/p/client.v8.ports/builders/V8%20Android%20Arm64%20-%20builder/builds/4851

Original issue's description:
> Update implementation of atomics with latest Chromium version but use compiler builtin atomics
>
> Ideally, we would use the standard library. However, when we are compiling against an older version of the standard library the atomic implementation may be slow.
>
> BUG=

TBR=mlippautz@chromium.org,ulan@chromium.org,jarin@chromium.org,hpayer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/6e162add3e6404d560049673fdd0ef4f6f2cf95d
Cr-Commit-Position: refs/heads/master@{#40489}

[Michael Achenbach, 2016-10-21 08:09:34]

The CQ bit was checked by machenbach@chromium.org

[Michael Achenbach, 2016-10-21 08:09:34]

Created Revert of Update implementation of atomics with latest Chromium version
but use compiler builtin atomics

[commit-bot: I haz the power, 2016-11-17 22:09:04]

Description was changed from

==========
Revert of Update implementation of atomics with latest Chromium version but use
compiler builtin atomics (patchset #10 id:190001 of
https://chromiumcodereview.appspot.com/2425963002/ )

Reason for revert:
https://build.chromium.org/p/client.v8.ports/builders/V8%20Android%20Arm64%20...

Original issue's description:
> Update implementation of atomics with latest Chromium version but use compiler
builtin atomics
> 
> Ideally, we would use the standard library. However, when we are compiling
against an older version of the standard library the atomic implementation may
be slow.
> 
> BUG=

TBR=mlippautz@chromium.org,ulan@chromium.org,jarin@chromium.org,hpayer@chromi...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=
==========

to

==========
Revert of Update implementation of atomics with latest Chromium version but use
compiler builtin atomics (patchset #10 id:190001 of
https://chromiumcodereview.appspot.com/2425963002/ )

Reason for revert:
https://build.chromium.org/p/client.v8.ports/builders/V8%20Android%20Arm64%20...

Original issue's description:
> Update implementation of atomics with latest Chromium version but use compiler
builtin atomics
>
> Ideally, we would use the standard library. However, when we are compiling
against an older version of the standard library the atomic implementation may
be slow.
>
> BUG=

TBR=mlippautz@chromium.org,ulan@chromium.org,jarin@chromium.org,hpayer@chromi...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/6e162add3e6404d560049673fdd0ef4f6f2cf95d
Cr-Commit-Position: refs/heads/master@{#40489}
==========