[turbofan] Fix impossible type handling for TypeGuard and BooleanNot.

[turbofan] Fix impossible type handling for TypeGuard and BooleanNot.

This also fixes incorrect type for fixed array accesses.

BUG=chromium:715651, v8:6309, chromium:715204
Review-Url: https://codereview.chromium.org/2848583002
Cr-Commit-Position: refs/heads/master@{#44926}
Committed: https://chromium.googlesource.com/v8/v8/+/ff2109d53efccb2642df26ae2156f56285822885

[Jarin, 2017-04-27 10:48:15]

The CQ bit was checked by jarin@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-27 10:48:19]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Jarin, 2017-04-27 10:51:09]

jarin@chromium.org changed reviewers:
+ bmeurer@chromium.org

[Jarin, 2017-04-27 10:51:10]

Could you take a look, please?

[Benedikt Meurer, 2017-04-27 11:06:35]

lgtm

[commit-bot: I haz the power, 2017-04-27 11:11:03]

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

[commit-bot: I haz the power, 2017-04-27 11:11:04]

Dry run: This issue passed the CQ dry run.

[Jarin, 2017-04-27 11:33:33]

The CQ bit was checked by jarin@chromium.org

[commit-bot: I haz the power, 2017-04-27 11:33:38]

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, 2017-04-27 11:35:16]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493292813057100, "parent_rev":
"9ceaf2127222a2341a72b6119bfd0ddcb70a35e4", "commit_rev":
"ff2109d53efccb2642df26ae2156f56285822885"}

[commit-bot: I haz the power, 2017-04-27 11:35:21]

Description was changed from

==========
[turbofan] Fix impossible type handling for TypeGuard and BooleanNot.

This also fixes incorrect type for fixed array accesses.

BUG=chromium:715651,v8:6309,chromium:715204
==========

to

==========
[turbofan] Fix impossible type handling for TypeGuard and BooleanNot.

This also fixes incorrect type for fixed array accesses.

BUG=chromium:715651,v8:6309,chromium:715204

Review-Url: https://codereview.chromium.org/2848583002
Cr-Commit-Position: refs/heads/master@{#44926}
Committed:
https://chromium.googlesource.com/v8/v8/+/ff2109d53efccb2642df26ae2156f562858...
==========

[commit-bot: I haz the power, 2017-04-27 11:35:22]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/ff2109d53efccb2642df26ae2156f562858...