PPC/s390: Reland "[turbofan] Discard the shared code entry in the optimized code map."

PPC/s390: Reland "[turbofan] Discard the shared code entry in the optimized code map."

Port ec132e05ec197e77b9ada8040eb5957cf4a753f5

Original commit message:

    (GcStress failure was unrelated.)

    At one time, we hoped to generate the same code for different
    native contexts. But in truth, much performance comes from optimizing
    on the native context. Now we abandon this pathway.

R=mvstanton@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/65b0b2d7bd47366b958fe229f81c48cc0eed272e
Cr-Commit-Position: refs/heads/master@{#40092}

[JaideepBajwa, 2016-10-07 15:01:17]

PTAL

[john.yan, 2016-10-07 15:02:12]

lgtm

[JaideepBajwa, 2016-10-07 15:02:44]

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

[commit-bot: I haz the power, 2016-10-07 15:02:53]

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, 2016-10-07 16:41:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-07 16:41:27]

Description was changed from

==========
PPC/s390: Reland "[turbofan] Discard the shared code entry in the optimized code
map."

Port ec132e05ec197e77b9ada8040eb5957cf4a753f5

Original commit message:

    (GcStress failure was unrelated.)

    At one time, we hoped to generate the same code for different
    native contexts. But in truth, much performance comes from optimizing
    on the native context. Now we abandon this pathway.

R=mvstanton@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: Reland "[turbofan] Discard the shared code entry in the optimized code
map."

Port ec132e05ec197e77b9ada8040eb5957cf4a753f5

Original commit message:

    (GcStress failure was unrelated.)

    At one time, we hoped to generate the same code for different
    native contexts. But in truth, much performance comes from optimizing
    on the native context. Now we abandon this pathway.

R=mvstanton@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/65b0b2d7bd47366b958fe229f81c48cc0eed272e
Cr-Commit-Position: refs/heads/master@{#40092}
==========

[commit-bot: I haz the power, 2016-10-07 16:41:27]

Patchset 1 (id:??) landed as
https://crrev.com/65b0b2d7bd47366b958fe229f81c48cc0eed272e
Cr-Commit-Position: refs/heads/master@{#40092}