PPC/s390: [everywhere] Custom representation for frame type

PPC/s390: [everywhere] Custom representation for frame type

Port fd596007f23a6f33b5d71b76a977400336f55d5a

Original Commit Message:

    Use an opaque format for the frame type marker on the stack, where the
    marker is simply shifted left by 1 instead of being a Smi. This allows
    us to generate simpler code for frame initialisation, as we can push a
    smaller value, decreasing the prologue by 4 bytes and one instruction.

R=leszeks@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2709483007
Cr-Commit-Position: refs/heads/master@{#43356}
Committed: https://chromium.googlesource.com/v8/v8/+/af76645baac4ba920b97dd55cbdc1df61ff31a39

[JaideepBajwa, 2017-02-21 18:50:36]

ptal

[john.yan, 2017-02-21 18:55:36]

lgtm

[JaideepBajwa, 2017-02-21 18:55:58]

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

[commit-bot: I haz the power, 2017-02-21 18:56:06]

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, 2017-02-21 19:21:30]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1487703358045140, "parent_rev":
"3e168a1ccf93ee8406e6475c0a856a4f15489477", "commit_rev":
"af76645baac4ba920b97dd55cbdc1df61ff31a39"}

[commit-bot: I haz the power, 2017-02-21 19:21:35]

Description was changed from

==========
PPC/s390: [everywhere] Custom representation for frame type

Port fd596007f23a6f33b5d71b76a977400336f55d5a

Original Commit Message:

    Use an opaque format for the frame type marker on the stack, where the
    marker is simply shifted left by 1 instead of being a Smi. This allows
    us to generate simpler code for frame initialisation, as we can push a
    smaller value, decreasing the prologue by 4 bytes and one instruction.

R=leszeks@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=
LOG=N
==========

to

==========
PPC/s390: [everywhere] Custom representation for frame type

Port fd596007f23a6f33b5d71b76a977400336f55d5a

Original Commit Message:

    Use an opaque format for the frame type marker on the stack, where the
    marker is simply shifted left by 1 instead of being a Smi. This allows
    us to generate simpler code for frame initialisation, as we can push a
    smaller value, decreasing the prologue by 4 bytes and one instruction.

R=leszeks@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2709483007
Cr-Commit-Position: refs/heads/master@{#43356}
Committed:
https://chromium.googlesource.com/v8/v8/+/af76645baac4ba920b97dd55cbdc1df61ff...
==========

[commit-bot: I haz the power, 2017-02-21 19:21:35]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/af76645baac4ba920b97dd55cbdc1df61ff...