S390: [cleanup] Drop FLAG_eliminate_prototype_chain_checks

S390: [cleanup] Drop FLAG_eliminate_prototype_chain_checks

port eac1b38d9ae4091fb7feb6568a070273b9483237

Original Commit Message:
    This flag has been on by default for a while, along with
    FLAG_track_prototype_users which provides the prerequisite
    infrastructure. We are now sure that this is the direction
    we want to go in, so in order to simplify the code, this CL
    drops the respective flag-off code paths.

R=jkummerow@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com
BUG=

Committed: https://crrev.com/0223cbd63d4dd5f4bb551f86d2d85e2ed551e550
Cr-Commit-Position: refs/heads/master@{#36491}

[john.yan, 2016-05-24 14:22:52]

PTAL

[john.yan, 2016-05-24 18:34:47]

The CQ bit was checked by jyan@ca.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2016-05-24 18:34:56]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2004173003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2004173003/1

[commit-bot: I haz the power, 2016-05-24 18:58:08]

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

[commit-bot: I haz the power, 2016-05-24 18:58:09]

Dry run: This issue passed the CQ dry run.

[JoranSiu, 2016-05-24 20:06:58]

On 2016/05/24 18:58:09, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

lgtm

[john.yan, 2016-05-24 20:10:51]

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

[commit-bot: I haz the power, 2016-05-24 20:10:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2004173003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2004173003/1

[commit-bot: I haz the power, 2016-05-24 20:13:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-24 20:14:26]

Description was changed from

==========
S390: [cleanup] Drop FLAG_eliminate_prototype_chain_checks

port eac1b38d9ae4091fb7feb6568a070273b9483237

Original Commit Message:
    This flag has been on by default for a while, along with
    FLAG_track_prototype_users which provides the prerequisite
    infrastructure. We are now sure that this is the direction
    we want to go in, so in order to simplify the code, this CL
    drops the respective flag-off code paths.

R=jkummerow@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com,
mbrandy@us.ibm.com
BUG=
==========

to

==========
S390: [cleanup] Drop FLAG_eliminate_prototype_chain_checks

port eac1b38d9ae4091fb7feb6568a070273b9483237

Original Commit Message:
    This flag has been on by default for a while, along with
    FLAG_track_prototype_users which provides the prerequisite
    infrastructure. We are now sure that this is the direction
    we want to go in, so in order to simplify the code, this CL
    drops the respective flag-off code paths.

R=jkummerow@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com,
mbrandy@us.ibm.com
BUG=

Committed: https://crrev.com/0223cbd63d4dd5f4bb551f86d2d85e2ed551e550
Cr-Commit-Position: refs/heads/master@{#36491}
==========

[commit-bot: I haz the power, 2016-05-24 20:14:27]

Patchset 1 (id:??) landed as
https://crrev.com/0223cbd63d4dd5f4bb551f86d2d85e2ed551e550
Cr-Commit-Position: refs/heads/master@{#36491}