[rng] improve RNG seed.

[rng] improve RNG seed.

Prior to this change, both 0 and 1 as RNG seed would result in the same
internal state. state0 and state1 cannot both be zero, but murmur hash
maps 0 back to 0.

R=cbruni@chromium.org
BUG=v8:5069
Committed: https://crrev.com/d75baead74452c92d80065c3c5c7d5171670e120
Cr-Commit-Position: refs/heads/master@{#36757}

[Camillo Bruni, 2016-06-06 12:41:53]

Personally it felt safer to just flip one bit in case of a 0 hash :) but I guess
the CHECK will do the rest.

LGTM

[Yang, 2016-06-06 12:49:15]

On 2016/06/06 12:41:53, Camillo Bruni wrote:
> Personally it felt safer to just flip one bit in case of a 0 hash :) but I
guess
> the CHECK will do the rest.
> 
> LGTM

It's really arbitrary imo.

[Yang, 2016-06-06 12:49:20]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2016-06-06 12:49:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2040953002/1

[commit-bot: I haz the power, 2016-06-06 14:50:01]

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

[commit-bot: I haz the power, 2016-06-06 14:50:02]

Try jobs failed on following builders:
  v8_linux_gcc_compile_rel on tryserver.v8 (JOB_TIMED_OUT, no build URL)

[Yang, 2016-06-06 14:50:40]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2016-06-06 14:50:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2040953002/1

[commit-bot: I haz the power, 2016-06-06 15:01:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-06 15:02:16]

Description was changed from

==========
[rng] improve RNG seed.

Prior to this change, both 0 and 1 as RNG seed would result in the same
internal state. state0 and state1 cannot both be zero, but murmur hash
maps 0 back to 0.

R=cbruni@chromium.org
BUG=v8:5069
==========

to

==========
[rng] improve RNG seed.

Prior to this change, both 0 and 1 as RNG seed would result in the same
internal state. state0 and state1 cannot both be zero, but murmur hash
maps 0 back to 0.

R=cbruni@chromium.org
BUG=v8:5069

Committed: https://crrev.com/d75baead74452c92d80065c3c5c7d5171670e120
Cr-Commit-Position: refs/heads/master@{#36757}
==========

[commit-bot: I haz the power, 2016-06-06 15:02:17]

Patchset 1 (id:??) landed as
https://crrev.com/d75baead74452c92d80065c3c5c7d5171670e120
Cr-Commit-Position: refs/heads/master@{#36757}