PPC: [wasm] Int64Lowering of Int64Add.

PPC: [wasm] Int64Lowering of Int64Add.

Port 1b230799364b7a6fbff3b0ffaee38bc06e19504b

Original commit message:
    Int64Add is lowered to a new turbofan operator, Int32AddPair. The new
    operator takes 4 inputs an generates 2 outputs. The inputs are the low
    word of the left input, high word of the left input, the low word of the
    right input, and high word of the right input. The ouputs are the low
    and high word of the result of the addition.

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

Committed: https://crrev.com/0548cf49d59cb7f59e1b0b4c2da79ca9a739abfb
Cr-Commit-Position: refs/heads/master@{#34797}

[MTBrandyberry, 2016-03-15 18:01:13]

PTAL

[MTBrandyberry, 2016-03-15 18:01:18]

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

[commit-bot: I haz the power, 2016-03-15 18:01:29]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1803113002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1803113002/1

[commit-bot: I haz the power, 2016-03-15 18:22:58]

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

[commit-bot: I haz the power, 2016-03-15 18:22:59]

Dry run: This issue passed the CQ dry run.

[john.yan, 2016-03-15 19:26:40]

lgtm

[MTBrandyberry, 2016-03-15 20:14:02]

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

[commit-bot: I haz the power, 2016-03-15 20:14:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1803113002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1803113002/1

[commit-bot: I haz the power, 2016-03-15 20:15:52]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-15 20:16:18]

Description was changed from

==========
PPC: [wasm] Int64Lowering of Int64Add.

Port 1b230799364b7a6fbff3b0ffaee38bc06e19504b

Original commit message:
    Int64Add is lowered to a new turbofan operator, Int32AddPair. The new
    operator takes 4 inputs an generates 2 outputs. The inputs are the low
    word of the left input, high word of the left input, the low word of the
    right input, and high word of the right input. The ouputs are the low
    and high word of the result of the addition.

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

to

==========
PPC: [wasm] Int64Lowering of Int64Add.

Port 1b230799364b7a6fbff3b0ffaee38bc06e19504b

Original commit message:
    Int64Add is lowered to a new turbofan operator, Int32AddPair. The new
    operator takes 4 inputs an generates 2 outputs. The inputs are the low
    word of the left input, high word of the left input, the low word of the
    right input, and high word of the right input. The ouputs are the low
    and high word of the result of the addition.

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

Committed: https://crrev.com/0548cf49d59cb7f59e1b0b4c2da79ca9a739abfb
Cr-Commit-Position: refs/heads/master@{#34797}
==========

[commit-bot: I haz the power, 2016-03-15 20:16:20]

Patchset 1 (id:??) landed as
https://crrev.com/0548cf49d59cb7f59e1b0b4c2da79ca9a739abfb
Cr-Commit-Position: refs/heads/master@{#34797}