PPC/s390: [TypeFeedbackVector] Root literal arrays in function literals slots

PPC/s390: [TypeFeedbackVector] Root literal arrays in function literals slots

Port b8294aaa978e972978b8d82cedf63befad5d7af1

Original Commit Message:

    Literal arrays and feedback vectors for a function can be garbage
    collected if we don't have a rooted closure for the function, which
    happens often. It's expensive to come back from this (recreating
    boilerplates and gathering feedback again), and the cost is
    disproportionate if the function was inlined into optimized code.

    To guard against losing these arrays when we need them, we'll now
    create literal arrays when creating the feedback vector for the outer
    closure, and root them strongly in that vector.

R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:5456
LOG=N

Review-Url: https://codereview.chromium.org/2626263002
Cr-Commit-Position: refs/heads/master@{#42280}
Committed: https://chromium.googlesource.com/v8/v8/+/be781e51f577723881d29028815d70270c9dc658

[JaideepBajwa, 2017-01-12 16:35:27]

ptal

[john.yan, 2017-01-12 17:25:57]

lgtm

[JaideepBajwa, 2017-01-12 17:33:16]

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

[commit-bot: I haz the power, 2017-01-12 17:33:25]

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, 2017-01-12 17:57:02]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484242396245010, "parent_rev":
"df5417ae7640de40e2342ad0c16a64f4138279bc", "commit_rev":
"be781e51f577723881d29028815d70270c9dc658"}

[commit-bot: I haz the power, 2017-01-12 17:57:09]

Description was changed from

==========
PPC/s390: [TypeFeedbackVector] Root literal arrays in function literals slots

Port b8294aaa978e972978b8d82cedf63befad5d7af1

Original Commit Message:

    Literal arrays and feedback vectors for a function can be garbage
    collected if we don't have a rooted closure for the function, which
    happens often. It's expensive to come back from this (recreating
    boilerplates and gathering feedback again), and the cost is
    disproportionate if the function was inlined into optimized code.

    To guard against losing these arrays when we need them, we'll now
    create literal arrays when creating the feedback vector for the outer
    closure, and root them strongly in that vector.

R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=v8:5456
LOG=N
==========

to

==========
PPC/s390: [TypeFeedbackVector] Root literal arrays in function literals slots

Port b8294aaa978e972978b8d82cedf63befad5d7af1

Original Commit Message:

    Literal arrays and feedback vectors for a function can be garbage
    collected if we don't have a rooted closure for the function, which
    happens often. It's expensive to come back from this (recreating
    boilerplates and gathering feedback again), and the cost is
    disproportionate if the function was inlined into optimized code.

    To guard against losing these arrays when we need them, we'll now
    create literal arrays when creating the feedback vector for the outer
    closure, and root them strongly in that vector.

R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=v8:5456
LOG=N

Review-Url: https://codereview.chromium.org/2626263002
Cr-Commit-Position: refs/heads/master@{#42280}
Committed:
https://chromium.googlesource.com/v8/v8/+/be781e51f577723881d29028815d70270c9...
==========

[commit-bot: I haz the power, 2017-01-12 17:57:09]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/be781e51f577723881d29028815d70270c9...