[turbofan] Properly merge compatible field access infos.

[turbofan] Properly merge compatible field access infos.

For a polymorphic access to o.x we would only merge it into a single
PropertyAccessInfo so far, if x is at the same offset in all maps and
the property index of x (in the descriptor arrays) is the same. But that
doesn't matter for code generation and blocks optimizations even.

BUG=v8:6278, v8:6344, v8:6396
R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2883883002
Cr-Commit-Position: refs/heads/master@{#45294}
Committed: https://chromium.googlesource.com/v8/v8/+/130d7dc34cc2281a7d940edc901fb0fc8c88095f

[Benedikt Meurer, 2017-05-15 08:25:37]

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

[commit-bot: I haz the power, 2017-05-15 08:25:43]

Dry run: CQ is trying da patch.

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

[Jarin, 2017-05-15 08:40:51]

lgtm

[Benedikt Meurer, 2017-05-15 09:02:21]

The CQ bit was unchecked by bmeurer@chromium.org

[Benedikt Meurer, 2017-05-15 09:02:22]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2017-05-15 09:02:25]

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, 2017-05-15 09:03:59]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1494838942689750, "parent_rev":
"1073dc987b57b354134c46d0f9296efc65ec6bec", "commit_rev":
"130d7dc34cc2281a7d940edc901fb0fc8c88095f"}

[commit-bot: I haz the power, 2017-05-15 09:04:06]

Description was changed from

==========
[turbofan] Properly merge compatible field access infos.

For a polymorphic access to o.x we would only merge it into a single
PropertyAccessInfo so far, if x is at the same offset in all maps and
the property index of x (in the descriptor arrays) is the same. But that
doesn't matter for code generation and blocks optimizations even.

BUG=v8:6278,v8:6344,v8:6396
R=jarin@chromium.org
==========

to

==========
[turbofan] Properly merge compatible field access infos.

For a polymorphic access to o.x we would only merge it into a single
PropertyAccessInfo so far, if x is at the same offset in all maps and
the property index of x (in the descriptor arrays) is the same. But that
doesn't matter for code generation and blocks optimizations even.

BUG=v8:6278,v8:6344,v8:6396
R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2883883002
Cr-Commit-Position: refs/heads/master@{#45294}
Committed:
https://chromium.googlesource.com/v8/v8/+/130d7dc34cc2281a7d940edc901fb0fc8c8...
==========

[commit-bot: I haz the power, 2017-05-15 09:04:07]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/130d7dc34cc2281a7d940edc901fb0fc8c8...