PPC/s390: Use Variable::binding_needs_init() to determine hole initialization

PPC/s390: Use Variable::binding_needs_init() to determine hole initialization

Port 6768456db513936cb19c8cdc657a7cd6122584a9

Original commit message:

    The old code was using VariableMode, but that signal is both
    over-pessimistic (some CONST and LET variables need no hole-initialization)
    and inconsistent with other uses of the InitializationFlag enum (such
    as %LoadLookupSlot).

    This changes no observable behavior, but removes unnecessary hole
    initialization and hole checks in a few places, including
    block-scoped function declarations, super property lookups,
    and new.target.

R=adamk@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/04c51b214f99d3c77f7c7fc1d46ba2b29b9c63f5
Cr-Commit-Position: refs/heads/master@{#38551}

[JaideepBajwa, 2016-08-10 16:08:52]

PTAL

[john.yan, 2016-08-10 16:22:11]

lgtm

[JaideepBajwa, 2016-08-10 16:22:34]

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

[commit-bot: I haz the power, 2016-08-10 16:22:44]

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, 2016-08-10 16:43:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-10 16:44:07]

Description was changed from

==========
PPC/s390: Use Variable::binding_needs_init() to determine hole initialization

Port 6768456db513936cb19c8cdc657a7cd6122584a9

Original commit message:

    The old code was using VariableMode, but that signal is both
    over-pessimistic (some CONST and LET variables need no hole-initialization)
    and inconsistent with other uses of the InitializationFlag enum (such
    as %LoadLookupSlot).

    This changes no observable behavior, but removes unnecessary hole
    initialization and hole checks in a few places, including
    block-scoped function declarations, super property lookups,
    and new.target.

R=adamk@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: Use Variable::binding_needs_init() to determine hole initialization

Port 6768456db513936cb19c8cdc657a7cd6122584a9

Original commit message:

    The old code was using VariableMode, but that signal is both
    over-pessimistic (some CONST and LET variables need no hole-initialization)
    and inconsistent with other uses of the InitializationFlag enum (such
    as %LoadLookupSlot).

    This changes no observable behavior, but removes unnecessary hole
    initialization and hole checks in a few places, including
    block-scoped function declarations, super property lookups,
    and new.target.

R=adamk@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/04c51b214f99d3c77f7c7fc1d46ba2b29b9c63f5
Cr-Commit-Position: refs/heads/master@{#38551}
==========

[commit-bot: I haz the power, 2016-08-10 16:44:08]

Patchset 1 (id:??) landed as
https://crrev.com/04c51b214f99d3c77f7c7fc1d46ba2b29b9c63f5
Cr-Commit-Position: refs/heads/master@{#38551}