PPC/s390: [full-codegen] Eliminate unnecessary hole checks for stores

PPC/s390: [full-codegen] Eliminate unnecessary hole checks for stores

Port 231c8ac0a78dd3d28f5398452c139062430ff008

Original commit message:
  Loads already used source position elimination to avoid unnecessary hole checks,
  but for reasons unknown stores did not. This CL corrects that, making full-codegen's
  hole elimination equivalent to ignition's.

  Also introduced a HoleCheckMode enum class to avoid more bool flags and updated
  VariableProxy and BytecodeGenerator appropriately.

R=adamk@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, bjaideep@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com
BUG=

Committed: https://crrev.com/e39a7c7187817227d5c47df4603d2c3431bff6cb
Cr-Commit-Position: refs/heads/master@{#40538}

[JaideepBajwa, 2016-10-24 14:45:15]

lgtm

[yangtian.zi, 2016-10-24 14:53:53]

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

[commit-bot: I haz the power, 2016-10-24 14:53:55]

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, 2016-10-24 14:53:56]

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

[commit-bot: I haz the power, 2016-10-24 14:53:57]

No L-G-T-M from a valid reviewer yet. 
CQ run can only be started by full committers or once the patch has
received an L-G-T-M from a full committer.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
Committers are members of the group "project-v8-committers".
Note that this has nothing to do with OWNERS files.

[john.yan, 2016-10-24 15:44:20]

lgtm

[yangtian.zi, 2016-10-24 16:04:08]

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

[commit-bot: I haz the power, 2016-10-24 16:04:16]

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, 2016-10-24 16:33:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 22:11:20]

Description was changed from

==========
PPC/s390: [full-codegen] Eliminate unnecessary hole checks for stores

Port 231c8ac0a78dd3d28f5398452c139062430ff008

Original commit message:
  Loads already used source position elimination to avoid unnecessary hole
checks,
  but for reasons unknown stores did not. This CL corrects that, making
full-codegen's
  hole elimination equivalent to ignition's.

  Also introduced a HoleCheckMode enum class to avoid more bool flags and
updated
  VariableProxy and BytecodeGenerator appropriately.

R=adamk@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, bjaideep@ca.ibm.com,
michael_dawson@ca.ibm.com, mbrandy@us.ibm.com
BUG=
==========

to

==========
PPC/s390: [full-codegen] Eliminate unnecessary hole checks for stores

Port 231c8ac0a78dd3d28f5398452c139062430ff008

Original commit message:
  Loads already used source position elimination to avoid unnecessary hole
checks,
  but for reasons unknown stores did not. This CL corrects that, making
full-codegen's
  hole elimination equivalent to ignition's.

  Also introduced a HoleCheckMode enum class to avoid more bool flags and
updated
  VariableProxy and BytecodeGenerator appropriately.

R=adamk@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, bjaideep@ca.ibm.com,
michael_dawson@ca.ibm.com, mbrandy@us.ibm.com
BUG=

Committed: https://crrev.com/e39a7c7187817227d5c47df4603d2c3431bff6cb
Cr-Commit-Position: refs/heads/master@{#40538}
==========

[commit-bot: I haz the power, 2016-11-17 22:11:21]

Patchset 1 (id:??) landed as
https://crrev.com/e39a7c7187817227d5c47df4603d2c3431bff6cb
Cr-Commit-Position: refs/heads/master@{#40538}