[compiler] Initial TurboFan code stubs for abstract relational comparison.

[compiler] Initial TurboFan code stubs for abstract relational comparison.

This adds new code stubs for abstract relational comparison,
namely LessThanStub, LessThanOrEqualStub, GreaterThanStub and
GreaterThanOrEqualStub, and hooks them up for Ignition and TurboFan.
These stubs implement the full compare operation without any
unpredictable bailouts. Currently they still go to C++ for string
comparisons, and also use the %ToPrimitive_Number runtime entry, as
we still lack a stub for the ToPrimitive operation. These issues
will be addressed separately in follow-up CLs.

Drive-by-fix: Add support for deferred code in the RawMachineAssembler
and CodeStubAssembler. A block can be marked as deferred by marking its
Label as deferred, which will then make the register allocator penalize
this block and prefer better register assignments for the other blocks.

R=epertoso@chromium.org

Committed: https://crrev.com/62bc168d6e84d053d528c71bb7eb4e5c923feec1
Cr-Commit-Position: refs/heads/master@{#34463}

[Benedikt Meurer, 2016-03-03 13:14:41]

Hey Enrico,

Here's the next bunch of TurboFan code stubs, plus bonus deferred code. :-)
Please take a look.

Thanks,
Benedikt

[epertoso, 2016-03-03 14:00:03]

lgtm

[Benedikt Meurer (Google), 2016-03-03 16:36:36]

The CQ bit was checked by bmeurer@google.com

[commit-bot: I haz the power, 2016-03-03 16:36:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1759133002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1759133002/1

[commit-bot: I haz the power, 2016-03-03 16:39:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-03 16:40:03]

Description was changed from

==========
[compiler] Initial TurboFan code stubs for abstract relational comparison.

This adds new code stubs for abstract relational comparison,
namely LessThanStub, LessThanOrEqualStub, GreaterThanStub and
GreaterThanOrEqualStub, and hooks them up for Ignition and TurboFan.
These stubs implement the full compare operation without any
unpredictable bailouts. Currently they still go to C++ for string
comparisons, and also use the %ToPrimitive_Number runtime entry, as
we still lack a stub for the ToPrimitive operation. These issues
will be addressed separately in follow-up CLs.

Drive-by-fix: Add support for deferred code in the RawMachineAssembler
and CodeStubAssembler. A block can be marked as deferred by marking its
Label as deferred, which will then make the register allocator penalize
this block and prefer better register assignments for the other blocks.

R=epertoso@chromium.org
==========

to

==========
[compiler] Initial TurboFan code stubs for abstract relational comparison.

This adds new code stubs for abstract relational comparison,
namely LessThanStub, LessThanOrEqualStub, GreaterThanStub and
GreaterThanOrEqualStub, and hooks them up for Ignition and TurboFan.
These stubs implement the full compare operation without any
unpredictable bailouts. Currently they still go to C++ for string
comparisons, and also use the %ToPrimitive_Number runtime entry, as
we still lack a stub for the ToPrimitive operation. These issues
will be addressed separately in follow-up CLs.

Drive-by-fix: Add support for deferred code in the RawMachineAssembler
and CodeStubAssembler. A block can be marked as deferred by marking its
Label as deferred, which will then make the register allocator penalize
this block and prefer better register assignments for the other blocks.

R=epertoso@chromium.org

Committed: https://crrev.com/62bc168d6e84d053d528c71bb7eb4e5c923feec1
Cr-Commit-Position: refs/heads/master@{#34463}
==========

[commit-bot: I haz the power, 2016-03-03 16:40:04]

Patchset 1 (id:??) landed as
https://crrev.com/62bc168d6e84d053d528c71bb7eb4e5c923feec1
Cr-Commit-Position: refs/heads/master@{#34463}