PPC: [runtime] Replace the EQUALS builtin with proper Object::Equals.

PPC: [runtime] Replace the EQUALS builtin with proper Object::Equals.

Port 54bab695f5de5bf5948c5b50b217628a00d60f91

Original commit message:
    Move the implementation of the Abstract Equality Comparison to the
    runtime and thereby remove the EQUALS dispatcher builtin. Also remove
    the various runtime entry points that were only used to support the
    EQUALS builtin.

    Now the Abstract Equality Comparison is also using the correct
    ToPrimitive implementation, which properly supports @@toPrimitive.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, dstence@us.ibm.com
BUG=v8:4307
LOG=n

Committed: https://crrev.com/92eed98b144b5683ba821257aa7f8a519363fdb1
Cr-Commit-Position: refs/heads/master@{#30810}

[MTBrandyberry, 2015-09-17 16:14:54]

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

[MTBrandyberry, 2015-09-17 16:14:58]

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

[MTBrandyberry, 2015-09-17 16:15:09]

The CQ bit was checked by mbrandy@us.ibm.com to run a CQ dry run

[john.yan, 2015-09-17 16:29:24]

lgtm

[MTBrandyberry, 2015-09-17 16:35:56]

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

[MTBrandyberry, 2015-09-17 16:35:58]

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

[commit-bot: I haz the power, 2015-09-17 16:40:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1357493002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1357493002/1

[Benedikt Meurer, 2015-09-17 16:52:16]

lgtm

[commit-bot: I haz the power, 2015-09-17 17:16:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-17 17:17:00]

Patchset 1 (id:??) landed as
https://crrev.com/92eed98b144b5683ba821257aa7f8a519363fdb1
Cr-Commit-Position: refs/heads/master@{#30810}