PPC: [compiler] Drop the CompareNilIC.

PPC: [compiler] Drop the CompareNilIC.

Port fb59ea3334bef0f4d2a1dd4b579bf5eec3bc1f35

Original commit message:
    Since both null and undefined are also marked as undetectable now, we
    can just test that bit instead of having the CompareNilIC try to collect
    feedback to speed up the general case (without the undetectable bit
    being used).

    Drive-by-fix: Update the type system to match the new handling of
    undetectable in the runtime.

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

Committed: https://crrev.com/0a287e230b9f5503f9edca827d1e7770a5849a5b
Cr-Commit-Position: refs/heads/master@{#34371}

[JoranSiu, 2016-02-29 19:45:25]

On 2016/02/29 15:56:02, MTBrandyberry wrote:

lgtm

[MTBrandyberry, 2016-02-29 19:45:43]

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

[commit-bot: I haz the power, 2016-02-29 19:45:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1742333002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1742333002/1

[commit-bot: I haz the power, 2016-02-29 19:50:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-02-29 19:50:36]

Try jobs failed on following builders:
  v8_mac_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel/builds/16224)

[MTBrandyberry, 2016-02-29 20:13:58]

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

[commit-bot: I haz the power, 2016-02-29 20:14:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1742333002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1742333002/1

[commit-bot: I haz the power, 2016-02-29 20:27:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-29 20:28:01]

Description was changed from

==========
PPC: [compiler] Drop the CompareNilIC.

Port fb59ea3334bef0f4d2a1dd4b579bf5eec3bc1f35

Original commit message:
    Since both null and undefined are also marked as undetectable now, we
    can just test that bit instead of having the CompareNilIC try to collect
    feedback to speed up the general case (without the undetectable bit
    being used).

    Drive-by-fix: Update the type system to match the new handling of
    undetectable in the runtime.

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

to

==========
PPC: [compiler] Drop the CompareNilIC.

Port fb59ea3334bef0f4d2a1dd4b579bf5eec3bc1f35

Original commit message:
    Since both null and undefined are also marked as undetectable now, we
    can just test that bit instead of having the CompareNilIC try to collect
    feedback to speed up the general case (without the undetectable bit
    being used).

    Drive-by-fix: Update the type system to match the new handling of
    undetectable in the runtime.

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

Committed: https://crrev.com/0a287e230b9f5503f9edca827d1e7770a5849a5b
Cr-Commit-Position: refs/heads/master@{#34371}
==========

[commit-bot: I haz the power, 2016-02-29 20:28:02]

Patchset 1 (id:??) landed as
https://crrev.com/0a287e230b9f5503f9edca827d1e7770a5849a5b
Cr-Commit-Position: refs/heads/master@{#34371}