[turbofan] Constant-fold ToNumber conversions.

[turbofan] Constant-fold ToNumber conversions.

We can constant-fold JSToNumber conversions during typed lowering
if the input is a known primitive constant (i.e. a string, oddball
or number). I.e. JSToNumber("123") can be constant-folded to 123.

R=jarin@chromium.org

Committed: https://crrev.com/1f85ff077d90cac6e2d57a4d5234f760436cbe55
Cr-Commit-Position: refs/heads/master@{#33654}

[Benedikt Meurer, 2016-02-02 05:40:53]

Hey Jaro,

Simple optimization for JSToNumber.
Please take a look.

Thanks,
Benedikt

[Jarin, 2016-02-02 06:25:21]

lgtm

[Benedikt Meurer, 2016-02-02 06:40:32]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2016-02-02 06:40:33]

The patchset sent to the CQ was uploaded after l-g-t-m from jarin@chromium.org
Link to the patchset: https://codereview.chromium.org/1657213002/#ps20001
(title: "Preserve identity of ToNumber w/ number nodes.")

[commit-bot: I haz the power, 2016-02-02 06:40:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1657213002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1657213002/20001

[commit-bot: I haz the power, 2016-02-02 07:01:50]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-02-02 07:02:25]

Description was changed from

==========
[turbofan] Constant-fold ToNumber conversions.

We can constant-fold JSToNumber conversions during typed lowering
if the input is a known primitive constant (i.e. a string, oddball
or number). I.e. JSToNumber("123") can be constant-folded to 123.

R=jarin@chromium.org
==========

to

==========
[turbofan] Constant-fold ToNumber conversions.

We can constant-fold JSToNumber conversions during typed lowering
if the input is a known primitive constant (i.e. a string, oddball
or number). I.e. JSToNumber("123") can be constant-folded to 123.

R=jarin@chromium.org

Committed: https://crrev.com/1f85ff077d90cac6e2d57a4d5234f760436cbe55
Cr-Commit-Position: refs/heads/master@{#33654}
==========

[commit-bot: I haz the power, 2016-02-02 07:02:25]

Patchset 2 (id:??) landed as
https://crrev.com/1f85ff077d90cac6e2d57a4d5234f760436cbe55
Cr-Commit-Position: refs/heads/master@{#33654}