Revert of [Atomics] Implement ldaxr/stlxr instructions in ARM64 simulator

Revert of [Atomics] Implement ldaxr/stlxr instructions in ARM64 simulator (patchset #8 id:140001 of https://codereview.chromium.org/2711473002/ )

Reason for revert:
The tree is closed due to an msan violation (use of uninitialized value) in the arm64 simulator soon after this patch landed; this seems related

https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/builds/13607/steps/Check/logs/simulator_invalidate_..

Original issue's description:
> [Atomics] Implement ldaxr/stlxr instructions in ARM64 simulator
> 
> BUG=v8:4614
> R=binji@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2711473002
> Cr-Commit-Position: refs/heads/master@{#43461}
> Committed: https://chromium.googlesource.com/v8/v8/+/a2a2c1b9eeccd86e77f2c7e6eda3e1b09bb5306c

TBR=binji@chromium.org,jarin@chromium.org,jacob.bramley@arm.com,aseemgarg@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4614
Review-Url: https://codereview.chromium.org/2720133003
Cr-Commit-Position: refs/heads/master@{#43463}
Committed: https://chromium.googlesource.com/v8/v8/+/2362f869a4675c10890397ab5d9694b4ac13f009

[Dan Ehrenberg, 2017-02-27 22:47:00]

The CQ bit was checked by littledan@chromium.org

[Dan Ehrenberg, 2017-02-27 22:47:00]

Created Revert of [Atomics] Implement ldaxr/stlxr instructions in ARM64
simulator

[commit-bot: I haz the power, 2017-02-27 22:47:08]

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 22:47:15]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488235620617910, "parent_rev":
"5a04f4fd68d1d35d704cdc0dee0719c5354a8094", "commit_rev":
"2362f869a4675c10890397ab5d9694b4ac13f009"}

[commit-bot: I haz the power, 2017-02-27 22:47:20]

Description was changed from

==========
Revert of [Atomics] Implement ldaxr/stlxr instructions in ARM64 simulator
(patchset #8 id:140001 of https://codereview.chromium.org/2711473002/ )

Reason for revert:
The tree is closed due to an msan violation (use of uninitialized value) in the
arm64 simulator soon after this patch landed; this seems related

https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20....

Original issue's description:
> [Atomics] Implement ldaxr/stlxr instructions in ARM64 simulator
> 
> BUG=v8:4614
> R=binji@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2711473002
> Cr-Commit-Position: refs/heads/master@{#43461}
> Committed:
https://chromium.googlesource.com/v8/v8/+/a2a2c1b9eeccd86e77f2c7e6eda3e1b09bb...

TBR=binji@chromium.org,jarin@chromium.org,jacob.bramley@arm.com,aseemgarg@chr...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4614
==========

to

==========
Revert of [Atomics] Implement ldaxr/stlxr instructions in ARM64 simulator
(patchset #8 id:140001 of https://codereview.chromium.org/2711473002/ )

Reason for revert:
The tree is closed due to an msan violation (use of uninitialized value) in the
arm64 simulator soon after this patch landed; this seems related

https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20....

Original issue's description:
> [Atomics] Implement ldaxr/stlxr instructions in ARM64 simulator
> 
> BUG=v8:4614
> R=binji@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2711473002
> Cr-Commit-Position: refs/heads/master@{#43461}
> Committed:
https://chromium.googlesource.com/v8/v8/+/a2a2c1b9eeccd86e77f2c7e6eda3e1b09bb...

TBR=binji@chromium.org,jarin@chromium.org,jacob.bramley@arm.com,aseemgarg@chr...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4614

Review-Url: https://codereview.chromium.org/2720133003
Cr-Commit-Position: refs/heads/master@{#43463}
Committed:
https://chromium.googlesource.com/v8/v8/+/2362f869a4675c10890397ab5d9694b4ac1...
==========

[commit-bot: I haz the power, 2017-02-27 22:47:21]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/2362f869a4675c10890397ab5d9694b4ac1...