[csa] Fix CSA::ToUint32 rounding for negative HeapNumbers

[csa] Fix CSA::ToUint32 rounding for negative HeapNumbers

The spec requires truncation while ToUint32 originally rounded down.
This also adds a bunch of test cases to check edge case behavior.

BUG=v8:6212
Review-Url: https://codereview.chromium.org/2805783003
Cr-Commit-Position: refs/heads/master@{#44487}
Committed: https://chromium.googlesource.com/v8/v8/+/52a53da5a4ee252ce47b9c396047610901a446cf

[jgruber, 2017-04-07 11:33:30]

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

[commit-bot: I haz the power, 2017-04-07 11:33:39]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[jgruber, 2017-04-07 11:34:57]

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

[commit-bot: I haz the power, 2017-04-07 11:35:01]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[jgruber, 2017-04-07 11:37:20]

jgruber@chromium.org changed reviewers:
+ jkummerow@chromium.org

[commit-bot: I haz the power, 2017-04-07 11:55:31]

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

[commit-bot: I haz the power, 2017-04-07 11:55:32]

Dry run: Try jobs failed on following builders:
  v8_mac_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel_ng/builds/20588)
  v8_mac_rel_ng_triggered on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel_ng_triggered/bui...)

[Jakob Kummerow, 2017-04-07 12:05:51]

lgtm

[jgruber, 2017-04-07 12:20:39]

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

[commit-bot: I haz the power, 2017-04-07 12:20:48]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[jgruber, 2017-04-07 12:46:08]

The CQ bit was unchecked by jgruber@chromium.org

[jgruber, 2017-04-07 12:46:12]

The CQ bit was checked by jgruber@chromium.org

[jgruber, 2017-04-07 12:46:13]

The patchset sent to the CQ was uploaded after l-g-t-m from
jkummerow@chromium.org
Link to the patchset: https://codereview.chromium.org/2805783003/#ps40001
(title: "Fix Smi::IsValid test")

[commit-bot: I haz the power, 2017-04-07 12:46:21]

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, 2017-04-07 12:50:15]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1491569172666160,
"parent_rev": "1be5279bcc52c37287d0090ade4f375dcf809ada", "commit_rev":
"52a53da5a4ee252ce47b9c396047610901a446cf"}

[commit-bot: I haz the power, 2017-04-07 12:50:22]

Description was changed from

==========
[csa] Fix CSA::ToUint32 rounding for negative HeapNumbers

The spec requires truncation while ToUint32 originally rounded down.
This also adds a bunch of test cases to check edge case behavior.

BUG=v8:6212
==========

to

==========
[csa] Fix CSA::ToUint32 rounding for negative HeapNumbers

The spec requires truncation while ToUint32 originally rounded down.
This also adds a bunch of test cases to check edge case behavior.

BUG=v8:6212

Review-Url: https://codereview.chromium.org/2805783003
Cr-Commit-Position: refs/heads/master@{#44487}
Committed:
https://chromium.googlesource.com/v8/v8/+/52a53da5a4ee252ce47b9c396047610901a...
==========

[commit-bot: I haz the power, 2017-04-07 12:50:23]

Committed patchset #3 (id:40001) as
https://chromium.googlesource.com/v8/v8/+/52a53da5a4ee252ce47b9c396047610901a...