[builtins] Introduce proper base::ieee754::log.

[builtins] Introduce proper base::ieee754::log.

This switches Math.log to use an fdlibm based version of log, imported
as base::ieee754::log, and use that consistently everywhere, i.e. change
the Float64Log TurboFan operators on Intel to use the C++ implementation
as well (same for Crankshaft).

R=yangguo@chromium.org
BUG=v8:5065, v8:5086
Committed: https://crrev.com/d0c7775d7cfec5ae628ab9f3f00cff09b01930ac
Cr-Commit-Position: refs/heads/master@{#36880}

[Benedikt Meurer, 2016-06-10 05:22:26]

Hey Yang,

Here's the fdlibm unification for Math.log, as discussed offline.
Please take a look.

Thanks,
Benedikt

[Yang, 2016-06-10 05:32:51]

lgtm

[Benedikt Meurer, 2016-06-10 05:33:11]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-06-10 05:33:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2053893003/20001

[commit-bot: I haz the power, 2016-06-10 05:52:05]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-06-10 05:54:20]

Description was changed from

==========
[builtins] Introduce proper base::ieee754::log.

This switches Math.log to use an fdlibm based version of log, imported
as base::ieee754::log, and use that consistently everywhere, i.e. change
the Float64Log TurboFan operators on Intel to use the C++ implementation
as well (same for Crankshaft).

R=yangguo@chromium.org
BUG=v8:5065,v8:5086
==========

to

==========
[builtins] Introduce proper base::ieee754::log.

This switches Math.log to use an fdlibm based version of log, imported
as base::ieee754::log, and use that consistently everywhere, i.e. change
the Float64Log TurboFan operators on Intel to use the C++ implementation
as well (same for Crankshaft).

R=yangguo@chromium.org
BUG=v8:5065,v8:5086

Committed: https://crrev.com/d0c7775d7cfec5ae628ab9f3f00cff09b01930ac
Cr-Commit-Position: refs/heads/master@{#36880}
==========

[commit-bot: I haz the power, 2016-06-10 05:54:21]

Patchset 2 (id:??) landed as
https://crrev.com/d0c7775d7cfec5ae628ab9f3f00cff09b01930ac
Cr-Commit-Position: refs/heads/master@{#36880}

[Michael Achenbach, 2016-06-10 07:39:31]

cc mtrofin

breaks greedy alloc