S390: [builtins] Migrate Math.log to TurboFan.

S390: [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, bjaideep@ca.ibm.com
BUG=

Committed: https://crrev.com/00c158a65c062055d8e80f57ee864c6f1c39464f
Cr-Commit-Position: refs/heads/master@{#36724}

[john.yan, 2016-06-03 19:03:57]

PTAL

[JaideepBajwa, 2016-06-04 01:46:20]

lgtm

[john.yan, 2016-06-04 01:59:23]

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

[commit-bot: I haz the power, 2016-06-04 01:59:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2033353003/1

[commit-bot: I haz the power, 2016-06-04 02:23:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-04 02:25:07]

Description was changed from

==========
S390: [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, bjaideep@ca.ibm.com
BUG=
==========

to

==========
S390: [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, bjaideep@ca.ibm.com
BUG=

Committed: https://crrev.com/00c158a65c062055d8e80f57ee864c6f1c39464f
Cr-Commit-Position: refs/heads/master@{#36724}
==========

[commit-bot: I haz the power, 2016-06-04 02:25:08]

Patchset 1 (id:??) landed as
https://crrev.com/00c158a65c062055d8e80f57ee864c6f1c39464f
Cr-Commit-Position: refs/heads/master@{#36724}