X87: [crankshaft] Refactor kAllowUndefinedAsNaN to kTruncatingToNumber.

X87: [crankshaft] Refactor kAllowUndefinedAsNaN to kTruncatingToNumber.

  port df981a9ff5c875fcd0ed2056b371968d5887a595 (r40577)

  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.

BUG=

Committed: https://crrev.com/9bc155b9c390f50c817ecca3ba54b4c107b82ea8
Cr-Commit-Position: refs/heads/master@{#40607}

[zhengxing.li, 2016-10-27 02:40:02]

zhengxing.li@intel.com changed reviewers:
+ bmeurer@chromium.org, chunyang.dai@intel.com, weiliang.lin@intel.com

[zhengxing.li, 2016-10-27 02:40:03]

PTAL, thanks!

[Weiliang, 2016-10-27 04:04:58]

lgtm

[zhengxing.li, 2016-10-27 04:08:20]

The CQ bit was checked by zhengxing.li@intel.com

[commit-bot: I haz the power, 2016-10-27 04:08:32]

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, 2016-10-27 04:32:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 22:14:51]

Description was changed from

==========
X87: [crankshaft] Refactor kAllowUndefinedAsNaN to kTruncatingToNumber.

  port df981a9ff5c875fcd0ed2056b371968d5887a595 (r40577)

  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.

BUG=
==========

to

==========
X87: [crankshaft] Refactor kAllowUndefinedAsNaN to kTruncatingToNumber.

  port df981a9ff5c875fcd0ed2056b371968d5887a595 (r40577)

  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.

BUG=

Committed: https://crrev.com/9bc155b9c390f50c817ecca3ba54b4c107b82ea8
Cr-Commit-Position: refs/heads/master@{#40607}
==========

[commit-bot: I haz the power, 2016-11-17 22:14:53]

Patchset 1 (id:??) landed as
https://crrev.com/9bc155b9c390f50c817ecca3ba54b4c107b82ea8
Cr-Commit-Position: refs/heads/master@{#40607}