PPC: [turbofan] Don't use the CompareIC in JSGenericLowering.

PPC: [turbofan] Don't use the CompareIC in JSGenericLowering.

Port d00da47b61462681b48e48bdff4a80a33da1a6d6

Original commit message:
    The CompareICStub produces an untagged raw word value, which has to be
    translated to true or false manually in the TurboFan code. But for lazy
    bailout after the CompareIC, we immediately go back to fullcodegen or
    Ignition with the raw value, to a location where both fullcodegen and
    Ignition expect a boolean value, which might crash or in the worst case
    (depending on the exact computation inside the CompareIC) could lead to
    arbitrary memory access.

    Short-term fix is to use the proper runtime functions (unified with the
    interpreter now) for comparisons. Next task is to provide optimized
    versions of these based on the CodeStubAssembler, which can then be used
    via code stubs in TurboFan or directly in handlers in the interpreter.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:4788
LOG=n

Committed: https://crrev.com/c1507e158780b170f25f0f1da87cb5d78a56faee
Cr-Commit-Position: refs/heads/master@{#34341}

[michael_dawson, 2016-02-26 21:55:11]

On 2016/02/26 21:54:12, MTBrandyberry wrote:

lgtm

[MTBrandyberry, 2016-02-26 21:55:40]

The CQ bit was checked by mbrandy@us.ibm.com

[commit-bot: I haz the power, 2016-02-26 21:55:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1745643002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1745643002/1

[commit-bot: I haz the power, 2016-02-26 22:13:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-26 22:15:02]

Description was changed from

==========
PPC: [turbofan] Don't use the CompareIC in JSGenericLowering.

Port d00da47b61462681b48e48bdff4a80a33da1a6d6

Original commit message:
    The CompareICStub produces an untagged raw word value, which has to be
    translated to true or false manually in the TurboFan code. But for lazy
    bailout after the CompareIC, we immediately go back to fullcodegen or
    Ignition with the raw value, to a location where both fullcodegen and
    Ignition expect a boolean value, which might crash or in the worst case
    (depending on the exact computation inside the CompareIC) could lead to
    arbitrary memory access.

    Short-term fix is to use the proper runtime functions (unified with the
    interpreter now) for comparisons. Next task is to provide optimized
    versions of these based on the CodeStubAssembler, which can then be used
    via code stubs in TurboFan or directly in handlers in the interpreter.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=v8:4788
LOG=n
==========

to

==========
PPC: [turbofan] Don't use the CompareIC in JSGenericLowering.

Port d00da47b61462681b48e48bdff4a80a33da1a6d6

Original commit message:
    The CompareICStub produces an untagged raw word value, which has to be
    translated to true or false manually in the TurboFan code. But for lazy
    bailout after the CompareIC, we immediately go back to fullcodegen or
    Ignition with the raw value, to a location where both fullcodegen and
    Ignition expect a boolean value, which might crash or in the worst case
    (depending on the exact computation inside the CompareIC) could lead to
    arbitrary memory access.

    Short-term fix is to use the proper runtime functions (unified with the
    interpreter now) for comparisons. Next task is to provide optimized
    versions of these based on the CodeStubAssembler, which can then be used
    via code stubs in TurboFan or directly in handlers in the interpreter.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=v8:4788
LOG=n

Committed: https://crrev.com/c1507e158780b170f25f0f1da87cb5d78a56faee
Cr-Commit-Position: refs/heads/master@{#34341}
==========

[commit-bot: I haz the power, 2016-02-26 22:15:03]

Patchset 1 (id:??) landed as
https://crrev.com/c1507e158780b170f25f0f1da87cb5d78a56faee
Cr-Commit-Position: refs/heads/master@{#34341}