PPC: [builtins] Migrate Math.log to TurboFan.

PPC: [builtins] Migrate Math.log to TurboFan.

Port f2da19fe393124c517f9949183e988e669e4f628

Original commit message:

    Introduce a dedicated Float64Log machine operator, that is either
    implemented by a direct C call or by platform specific code, i.e.
    using the FPU on x64 and ia32.

    This operator is used to implement Math.log as a proper TurboFan
    builtin on top of the CodeStubAssembler.

    Also introduce a NumberLog simplified operator on top of Float64Log
    and use that for the fast inline path of Math.log inside TurboFan
    optimized code.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:5065
LOG=N

Committed: https://crrev.com/0ed27704f6beb66857a894cceda46e0f6c3625d1
Cr-Commit-Position: refs/heads/master@{#36720}

[JaideepBajwa, 2016-06-03 15:57:45]

PTAL

[john.yan, 2016-06-03 16:22:42]

lgtm

[JaideepBajwa, 2016-06-03 16:23:12]

The CQ bit was checked by bjaideep@ca.ibm.com

[commit-bot: I haz the power, 2016-06-03 16:23:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2036273002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2036273002/1

[commit-bot: I haz the power, 2016-06-03 16:47:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-03 16:49:38]

Description was changed from

==========
PPC: [builtins] Migrate Math.log to TurboFan.

Port f2da19fe393124c517f9949183e988e669e4f628

Original commit message:

    Introduce a dedicated Float64Log machine operator, that is either
    implemented by a direct C call or by platform specific code, i.e.
    using the FPU on x64 and ia32.

    This operator is used to implement Math.log as a proper TurboFan
    builtin on top of the CodeStubAssembler.

    Also introduce a NumberLog simplified operator on top of Float64Log
    and use that for the fast inline path of Math.log inside TurboFan
    optimized code.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:5065
LOG=N
==========

to

==========
PPC: [builtins] Migrate Math.log to TurboFan.

Port f2da19fe393124c517f9949183e988e669e4f628

Original commit message:

    Introduce a dedicated Float64Log machine operator, that is either
    implemented by a direct C call or by platform specific code, i.e.
    using the FPU on x64 and ia32.

    This operator is used to implement Math.log as a proper TurboFan
    builtin on top of the CodeStubAssembler.

    Also introduce a NumberLog simplified operator on top of Float64Log
    and use that for the fast inline path of Math.log inside TurboFan
    optimized code.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:5065
LOG=N

Committed: https://crrev.com/0ed27704f6beb66857a894cceda46e0f6c3625d1
Cr-Commit-Position: refs/heads/master@{#36720}
==========

[commit-bot: I haz the power, 2016-06-03 16:49:39]

Patchset 1 (id:??) landed as
https://crrev.com/0ed27704f6beb66857a894cceda46e0f6c3625d1
Cr-Commit-Position: refs/heads/master@{#36720}