[runtime] Kill the %NumberToIntegerMapMinusZero runtime entry.

[runtime] Kill the %NumberToIntegerMapMinusZero runtime entry.

This was initially used to special case some weird date.js behavior, but
has since been abused in other areas. In case of the string character
access, everything that is outside the Smi range cannot be a valid
string index anyways, so %NumberToSmi is perfect here in either case,
and for ToPositiveInteger it's better to just use ToInteger adding +0 to
turn -0 into +0.

R=ishell@chromium.org
BUG=v8:5049
Committed: https://crrev.com/4b235adecc6edaf9f02c0fe9b34762a0f5ae937b
Cr-Commit-Position: refs/heads/master@{#36545}

[Benedikt Meurer, 2016-05-27 11:08:56]

Hey Igor,

Some cleanup on the runtime entries.
Please take a look.

Thanks,
Benedikt

[Igor Sheludko, 2016-05-27 11:31:11]

lgtm

[Benedikt Meurer, 2016-05-27 11:31:19]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-05-27 11:31:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2010183003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2010183003/1

[commit-bot: I haz the power, 2016-05-27 11:50:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-27 11:52:05]

Description was changed from

==========
[runtime] Kill the %NumberToIntegerMapMinusZero runtime entry.

This was initially used to special case some weird date.js behavior, but
has since been abused in other areas. In case of the string character
access, everything that is outside the Smi range cannot be a valid
string index anyways, so %NumberToSmi is perfect here in either case,
and for ToPositiveInteger it's better to just use ToInteger adding +0 to
turn -0 into +0.

R=ishell@chromium.org
BUG=v8:5049
==========

to

==========
[runtime] Kill the %NumberToIntegerMapMinusZero runtime entry.

This was initially used to special case some weird date.js behavior, but
has since been abused in other areas. In case of the string character
access, everything that is outside the Smi range cannot be a valid
string index anyways, so %NumberToSmi is perfect here in either case,
and for ToPositiveInteger it's better to just use ToInteger adding +0 to
turn -0 into +0.

R=ishell@chromium.org
BUG=v8:5049

Committed: https://crrev.com/4b235adecc6edaf9f02c0fe9b34762a0f5ae937b
Cr-Commit-Position: refs/heads/master@{#36545}
==========

[commit-bot: I haz the power, 2016-05-27 11:52:07]

Patchset 1 (id:??) landed as
https://crrev.com/4b235adecc6edaf9f02c0fe9b34762a0f5ae937b
Cr-Commit-Position: refs/heads/master@{#36545}