PPC: [turbofan] Prevent storing signalling NaNs into holey double arrays.

PPC: [turbofan] Prevent storing signalling NaNs into holey double arrays.

Port 6470ddadf93594657acee02b5ce5459752928490

Original commit message:

    This introduces SilenceNaN operator, which makes sure that we only
    store quiet NaNs into holey arrays. We omit the NaN silencing code
    at instruction selection time if the input is an operation that
    cannot possibly produce signalling NaNs.

R=jarin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=
LOG=N

Committed: https://crrev.com/3b6775639216ce09262746c5ebbc53589fe69c1b
Cr-Commit-Position: refs/heads/master@{#36981}

[JaideepBajwa, 2016-06-14 22:56:29]

PTAL

[john.yan, 2016-06-14 22:57:34]

lgtm

[JaideepBajwa, 2016-06-14 23:07:13]

The CQ bit was checked by bjaideep@ca.ibm.com

[commit-bot: I haz the power, 2016-06-14 23:07:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2069883002/1

[commit-bot: I haz the power, 2016-06-14 23:33:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-14 23:37:06]

Description was changed from

==========
PPC: [turbofan] Prevent storing signalling NaNs into holey double arrays.

Port 6470ddadf93594657acee02b5ce5459752928490

Original commit message:

    This introduces SilenceNaN operator, which makes sure that we only
    store quiet NaNs into holey arrays. We omit the NaN silencing code
    at instruction selection time if the input is an operation that
    cannot possibly produce signalling NaNs.

R=jarin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=
LOG=N
==========

to

==========
PPC: [turbofan] Prevent storing signalling NaNs into holey double arrays.

Port 6470ddadf93594657acee02b5ce5459752928490

Original commit message:

    This introduces SilenceNaN operator, which makes sure that we only
    store quiet NaNs into holey arrays. We omit the NaN silencing code
    at instruction selection time if the input is an operation that
    cannot possibly produce signalling NaNs.

R=jarin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=
LOG=N

Committed: https://crrev.com/3b6775639216ce09262746c5ebbc53589fe69c1b
Cr-Commit-Position: refs/heads/master@{#36981}
==========

[commit-bot: I haz the power, 2016-06-14 23:37:07]

Patchset 1 (id:??) landed as
https://crrev.com/3b6775639216ce09262746c5ebbc53589fe69c1b
Cr-Commit-Position: refs/heads/master@{#36981}