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

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

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.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_layout_dbg,v8_linux_nosnap_dbg
R=mstarzinger@chromium.org
BUG=v8:4307
LOG=n

Committed: https://crrev.com/54bab695f5de5bf5948c5b50b217628a00d60f91
Cr-Commit-Position: refs/heads/master@{#30747}

[Benedikt Meurer, 2015-09-15 11:30:00]

The CQ bit was checked by bmeurer@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-09-15 11:30:10]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1337993005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1337993005/1

[Benedikt Meurer, 2015-09-15 11:30:17]

Hey Michi,

The next weird builtin gone.
Please take a look.

Thanks,
Benedikt

[Michael Starzinger, 2015-09-15 11:52:56]

LGTM.

https://codereview.chromium.org/1337993005/diff/1/src/objects.h
File src/objects.h (right):

https://codereview.chromium.org/1337993005/diff/1/src/objects.h#newcode9109
src/objects.h:9109: DECLARE_CAST(Oddball)
nit: Move the caster down so that the dispatched behavior stays at the bottom.

[Benedikt Meurer, 2015-09-15 11:54:10]

https://codereview.chromium.org/1337993005/diff/1/src/objects.h
File src/objects.h (right):

https://codereview.chromium.org/1337993005/diff/1/src/objects.h#newcode9109
src/objects.h:9109: DECLARE_CAST(Oddball)
On 2015/09/15 11:52:56, Michael Starzinger wrote:
> nit: Move the caster down so that the dispatched behavior stays at the bottom.

Done.

[Benedikt Meurer, 2015-09-15 11:54:24]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2015-09-15 11:54:24]

The patchset sent to the CQ was uploaded after l-g-t-m from
mstarzinger@chromium.org
Link to the patchset: https://codereview.chromium.org/1337993005/#ps20001
(title: "Address Michi's nit.")

[commit-bot: I haz the power, 2015-09-15 11:54:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1337993005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1337993005/20001

[commit-bot: I haz the power, 2015-09-15 13:14:43]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-15 13:14:58]

Patchset 2 (id:??) landed as
https://crrev.com/54bab695f5de5bf5948c5b50b217628a00d60f91
Cr-Commit-Position: refs/heads/master@{#30747}