[heap] Fix off-by-one cell read in verification methods

[heap] Fix off-by-one cell read in verification methods

The actual value was always &-ed with 0 so technically correct. ASAN
rightfully complains when allocating an external bitmap though.

BUG=chromium:651354
R=ulan@chromium.org

Review-Url: https://codereview.chromium.org/2799283002
Cr-Commit-Position: refs/heads/master@{#44453}
Committed: https://chromium.googlesource.com/v8/v8/+/d265d3a274ee5766d370f3a977cc558099fbbd66

[Michael Lippautz, 2017-04-06 15:12:20]

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

[commit-bot: I haz the power, 2017-04-06 15:12:23]

Dry run: 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, 2017-04-06 15:43:39]

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

[commit-bot: I haz the power, 2017-04-06 15:43:39]

Dry run: This issue passed the CQ dry run.

[ulan, 2017-04-06 16:08:53]

lgtm

[Michael Lippautz, 2017-04-06 16:09:15]

The CQ bit was checked by mlippautz@chromium.org

[commit-bot: I haz the power, 2017-04-06 16:09:20]

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, 2017-04-06 16:12:25]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1491494955682200, "parent_rev":
"4f03ccdfcf7a559d0fff176c454716f26c737551", "commit_rev":
"d265d3a274ee5766d370f3a977cc558099fbbd66"}

[commit-bot: I haz the power, 2017-04-06 16:12:30]

Description was changed from

==========
[heap] Fix off-by-one cell read in verification methods

The actual value was always &-ed with 0 so technically correct. ASAN
rightfully complains when allocating an external bitmap though.

BUG=chromium:651354
R=ulan@chromium.org
==========

to

==========
[heap] Fix off-by-one cell read in verification methods

The actual value was always &-ed with 0 so technically correct. ASAN
rightfully complains when allocating an external bitmap though.

BUG=chromium:651354
R=ulan@chromium.org

Review-Url: https://codereview.chromium.org/2799283002
Cr-Commit-Position: refs/heads/master@{#44453}
Committed:
https://chromium.googlesource.com/v8/v8/+/d265d3a274ee5766d370f3a977cc558099f...
==========

[commit-bot: I haz the power, 2017-04-06 16:12:31]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/d265d3a274ee5766d370f3a977cc558099f...