PPC/s390: [crankshaft] Refactor kAllowUndefinedAsNaN to kTruncatingToNumber.

PPC/s390: [crankshaft] Refactor kAllowUndefinedAsNaN to kTruncatingToNumber.

Port df981a9ff5c875fcd0ed2056b371968d5887a595

Original commit message:

    The meaning of the HValue::kAllowUndefinedAsNaN is actually ToNumber
    conversion (except for the uses in HBranch and HCompareHoleAndBranch,
    which were confusing and useless anyways), so fix the naming to match
    that.

    Also properly integrate the handling of this flag with the existing
    truncation analysis that is run as part of the representation changes
    phase (i.e. where we already deal with truncating to int32 and smi).

    This is done in preparation of allowing Crankshaft to handle any kind
    of Oddball in the ToNumber truncation, instead of just undefined for
    truncation ToNumber and undefined or boolean for ToInt32. It also helps
    to make Crankshaft somewhat more compatible with the (saner)
    implementation in TurboFan.

R=bmeurer@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/35b3e01394145b4566539af0e4811e6716d765d8
Cr-Commit-Position: refs/heads/master@{#40593}

[JaideepBajwa, 2016-10-26 11:42:22]

ptal

[john.yan, 2016-10-26 14:15:49]

lgtm

[JaideepBajwa, 2016-10-26 14:16:14]

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

[commit-bot: I haz the power, 2016-10-26 14:16:16]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-26 14:40:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 22:14:06]

Description was changed from

==========
PPC/s390: [crankshaft] Refactor kAllowUndefinedAsNaN to kTruncatingToNumber.

Port df981a9ff5c875fcd0ed2056b371968d5887a595

Original commit message:

    The meaning of the HValue::kAllowUndefinedAsNaN is actually ToNumber
    conversion (except for the uses in HBranch and HCompareHoleAndBranch,
    which were confusing and useless anyways), so fix the naming to match
    that.

    Also properly integrate the handling of this flag with the existing
    truncation analysis that is run as part of the representation changes
    phase (i.e. where we already deal with truncating to int32 and smi).

    This is done in preparation of allowing Crankshaft to handle any kind
    of Oddball in the ToNumber truncation, instead of just undefined for
    truncation ToNumber and undefined or boolean for ToInt32. It also helps
    to make Crankshaft somewhat more compatible with the (saner)
    implementation in TurboFan.

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

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

to

==========
PPC/s390: [crankshaft] Refactor kAllowUndefinedAsNaN to kTruncatingToNumber.

Port df981a9ff5c875fcd0ed2056b371968d5887a595

Original commit message:

    The meaning of the HValue::kAllowUndefinedAsNaN is actually ToNumber
    conversion (except for the uses in HBranch and HCompareHoleAndBranch,
    which were confusing and useless anyways), so fix the naming to match
    that.

    Also properly integrate the handling of this flag with the existing
    truncation analysis that is run as part of the representation changes
    phase (i.e. where we already deal with truncating to int32 and smi).

    This is done in preparation of allowing Crankshaft to handle any kind
    of Oddball in the ToNumber truncation, instead of just undefined for
    truncation ToNumber and undefined or boolean for ToInt32. It also helps
    to make Crankshaft somewhat more compatible with the (saner)
    implementation in TurboFan.

R=bmeurer@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/35b3e01394145b4566539af0e4811e6716d765d8
Cr-Commit-Position: refs/heads/master@{#40593}
==========

[commit-bot: I haz the power, 2016-11-17 22:14:07]

Patchset 1 (id:??) landed as
https://crrev.com/35b3e01394145b4566539af0e4811e6716d765d8
Cr-Commit-Position: refs/heads/master@{#40593}