[arm] Correctly detect ARMv8 platforms with old kernels.

[arm] Correctly detect ARMv8 platforms with old kernels.

AArch64 kernels older than 3.18 presented a different cpuinfo format
than what V8 expects. Most of V8's logic still works, but it misreads
the "CPU architecture" field.

BUG=

Committed: https://crrev.com/4ee76dafc00c27989a3ee1389bc4cdaa728139a9
Cr-Commit-Position: refs/heads/master@{#35114}

[jbramley, 2016-03-29 15:51:08]

jacob.bramley@arm.com changed reviewers:
+ bmeurer@chromium.org, jarin@chromium.org

[Benedikt Meurer, 2016-03-29 17:04:08]

Nice. LGTM.

[jbramley, 2016-03-29 17:05:40]

The CQ bit was checked by jacob.bramley@arm.com

[commit-bot: I haz the power, 2016-03-29 17:05:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1841733002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1841733002/1

[commit-bot: I haz the power, 2016-03-29 17:34:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-29 17:36:58]

Description was changed from

==========
[arm] Correctly detect ARMv8 platforms with old kernels.

AArch64 kernels older than 3.18 presented a different cpuinfo format
than what V8 expects. Most of V8's logic still works, but it misreads
the "CPU architecture" field.

BUG=
==========

to

==========
[arm] Correctly detect ARMv8 platforms with old kernels.

AArch64 kernels older than 3.18 presented a different cpuinfo format
than what V8 expects. Most of V8's logic still works, but it misreads
the "CPU architecture" field.

BUG=

Committed: https://crrev.com/4ee76dafc00c27989a3ee1389bc4cdaa728139a9
Cr-Commit-Position: refs/heads/master@{#35114}
==========

[commit-bot: I haz the power, 2016-03-29 17:36:58]

Patchset 1 (id:??) landed as
https://crrev.com/4ee76dafc00c27989a3ee1389bc4cdaa728139a9
Cr-Commit-Position: refs/heads/master@{#35114}