[es6] Fix symbol comparison on some architectures

[es6] Fix symbol comparison on some architectures

https://codereview.chromium.org/1125783002 did not handle all cases for some
architectures. These cases are now covered, and tests have been extended to
check them.

BUG=v8:4073
LOG=N

Committed: https://crrev.com/382435480d682ea35c804c954ffc6f4fef78346b
Cr-Commit-Position: refs/heads/master@{#28266}

[conradw, 2015-05-06 14:43:00]

conradw@chromium.org changed reviewers:
+ arv@chromium.org, rossberg@chromium.org

[conradw, 2015-05-06 14:43:01]

PTAL - currently the extended test fails on the affected architectures.

[arv (Not doing code reviews), 2015-05-06 14:54:35]

LGTM

For once I actually ran the test on all platforms and still I missed these. It
is really sad how much the code have diverged between the platforms.

[conradw, 2015-05-06 14:57:29]

The CQ bit was checked by conradw@chromium.org

[commit-bot: I haz the power, 2015-05-06 14:57:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1128143002/1

[commit-bot: I haz the power, 2015-05-06 15:01:11]

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

[commit-bot: I haz the power, 2015-05-06 15:01:12]

Try jobs failed on following builders:
  v8_presubmit on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_presubmit/builds/2501)

[conradw, 2015-05-06 15:02:40]

The CQ bit was checked by conradw@chromium.org

[commit-bot: I haz the power, 2015-05-06 15:02:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1128143002/1

[conradw, 2015-05-06 15:03:55]

On 2015/05/06 14:54:35, arv wrote:
> LGTM
> 
> For once I actually ran the test on all platforms and still I missed these. It
> is really sad how much the code have diverged between the platforms.

Yes, this case is particularly miserable because the architectures that factor
this part out into EmitIdenticalObjectComparison test the special cases in a
rather different order.

[commit-bot: I haz the power, 2015-05-06 15:04:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-06 15:04:59]

Patchset 1 (id:??) landed as
https://crrev.com/382435480d682ea35c804c954ffc6f4fef78346b
Cr-Commit-Position: refs/heads/master@{#28266}