Fix run-time ARMv6 detection.

Fix run-time ARMv6 detection.

BUG=v8:3844
LOG=y
R=bmeurer@chromium.org

Committed: https://crrev.com/9e99a6048a651e8b780c713b0684f813cd74db34
Patch from Ben Noordhuis <info@bnoordhuis.nl>;.

Cr-Commit-Position: refs/heads/master@{#26234}

[bnoordhuis, 2015-01-22 20:48:16]

ben@strongloop.com changed reviewers:
+ bmeurer@chromium.org

[bnoordhuis, 2015-01-22 20:48:17]

See https://github.com/iojs/io.js/issues/283 for background.

Can this be back-ported to the 4.1 branch, please?  Should apply cleanly. 
Thanks!

[Benedikt Meurer, 2015-01-23 05:55:43]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2015-01-23 05:55:44]

lgtm

[commit-bot: I haz the power, 2015-01-23 05:58:26]

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

[commit-bot: I haz the power, 2015-01-23 05:58:26]

Commit queue rejected this change because it did not recognize the base URL.
Please commit your change manually.

[Benedikt Meurer, 2015-01-23 06:01:04]

Committed patchset #1 (id:1) manually as
9e99a6048a651e8b780c713b0684f813cd74db34 (presubmit successful).

[commit-bot: I haz the power, 2015-01-23 06:01:07]

Patchset 1 (id:??) landed as
https://crrev.com/9e99a6048a651e8b780c713b0684f813cd74db34
Cr-Commit-Position: refs/heads/master@{#26234}