[builtins] Make Math.ceil, Math.trunc and Math.round optimizable.

[builtins] Make Math.ceil, Math.trunc and Math.round optimizable.

Migrate Math.ceil, Math.round and Math.trunc to TurboFan code stubs,
similar to what we did with Math.floor, and make these builtins properly
optimizable in TurboFan via appropriate simplified operators NumberCeil,
NumberRound and NumberTrunc, which are intended to be reusable for
ToInteger and ToLength optimizations that will be done in a followup CL.

Also allows us to kill the funky %RoundNumber runtime function, which
was quite heavy.

Improve test coverage for Math.ceil and Math.trunc a lot, especially
making sure that we also properly trigger the TurboFan builtin reducer
case.

R=jarin@chromium.org
BUG=v8:4059
LOG=n

Committed: https://crrev.com/8d20f2fe37e43233a61d2c18e5214831fab4a96b
Cr-Commit-Position: refs/heads/master@{#35135}

[Benedikt Meurer, 2016-03-30 11:34:50]

Hey Jaro,

Here's the same change as I did for Math.floor for the other rounding functions.
Stuff is designed to be reusable for ToLength and ToInteger in both TurboFan
graphs and in the code stubs.
Please take a look.

Thanks,
Benedikt

[Jarin, 2016-03-30 11:48:56]

lgtm. Nice!

[Benedikt Meurer, 2016-03-30 11:49:08]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-03-30 11:49:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1841993002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1841993002/1

[commit-bot: I haz the power, 2016-03-30 11:56:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-30 11:57:25]

Description was changed from

==========
[builtins] Make Math.ceil, Math.trunc and Math.round optimizable.

Migrate Math.ceil, Math.round and Math.trunc to TurboFan code stubs,
similar to what we did with Math.floor, and make these builtins properly
optimizable in TurboFan via appropriate simplified operators NumberCeil,
NumberRound and NumberTrunc, which are intended to be reusable for
ToInteger and ToLength optimizations that will be done in a followup CL.

Also allows us to kill the funky %RoundNumber runtime function, which
was quite heavy.

Improve test coverage for Math.ceil and Math.trunc a lot, especially
making sure that we also properly trigger the TurboFan builtin reducer
case.

R=jarin@chromium.org
BUG=v8:4059
LOG=n
==========

to

==========
[builtins] Make Math.ceil, Math.trunc and Math.round optimizable.

Migrate Math.ceil, Math.round and Math.trunc to TurboFan code stubs,
similar to what we did with Math.floor, and make these builtins properly
optimizable in TurboFan via appropriate simplified operators NumberCeil,
NumberRound and NumberTrunc, which are intended to be reusable for
ToInteger and ToLength optimizations that will be done in a followup CL.

Also allows us to kill the funky %RoundNumber runtime function, which
was quite heavy.

Improve test coverage for Math.ceil and Math.trunc a lot, especially
making sure that we also properly trigger the TurboFan builtin reducer
case.

R=jarin@chromium.org
BUG=v8:4059
LOG=n

Committed: https://crrev.com/8d20f2fe37e43233a61d2c18e5214831fab4a96b
Cr-Commit-Position: refs/heads/master@{#35135}
==========

[commit-bot: I haz the power, 2016-03-30 11:57:26]

Patchset 1 (id:??) landed as
https://crrev.com/8d20f2fe37e43233a61d2c18e5214831fab4a96b
Cr-Commit-Position: refs/heads/master@{#35135}