PPC: [Interpreter] Add ForInPrepare runtime function which returns a ObjectTriple.

PPC: [Interpreter] Add ForInPrepare runtime function which returns a ObjectTriple.

Port 84f8a506e204b1e70df5b9a8036cc97170e661fd

Original commit message:
    Adds a ForInPrepare Runtime function which returns a triple of
    cache_type, cache_array and cache_length.

    This requires adding support to CEntryStub to call runtime functions
    which return a ObjectTriple - a struct containing three Object*
    pointers. Also did some cleanup of the x64 CEntryStub to avoid
    replicated code.

    Replaces the interpreter's use of the ad-hock InterpreterForInPrepare
    Runtime function with ForInPrepare in preparation for fixing deopt in
    BytecodeGraphBuilder for ForIn (which will be done in a followup CL).

R=rmcilroy@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:4280
LOG=N

Committed: https://crrev.com/b2c246e0a95d377de4c1ba20b8e67ed6c97300e6
Cr-Commit-Position: refs/heads/master@{#33342}

[MTBrandyberry, 2016-01-15 18:15:34]

The CQ bit was checked by mbrandy@us.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2016-01-15 18:15:39]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1586153004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1586153004/1

[commit-bot: I haz the power, 2016-01-15 18:31:29]

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

[commit-bot: I haz the power, 2016-01-15 18:31:30]

Dry run: This issue passed the CQ dry run.

[john.yan, 2016-01-15 19:01:26]

lgtm

[MTBrandyberry, 2016-01-15 19:03:20]

The CQ bit was checked by mbrandy@us.ibm.com

[commit-bot: I haz the power, 2016-01-15 19:03:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1586153004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1586153004/1

[commit-bot: I haz the power, 2016-01-15 19:05:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-15 19:06:42]

Description was changed from

==========
PPC: [Interpreter] Add ForInPrepare runtime function which returns a
ObjectTriple.

Port 84f8a506e204b1e70df5b9a8036cc97170e661fd

Original commit message:
    Adds a ForInPrepare Runtime function which returns a triple of
    cache_type, cache_array and cache_length.

    This requires adding support to CEntryStub to call runtime functions
    which return a ObjectTriple - a struct containing three Object*
    pointers. Also did some cleanup of the x64 CEntryStub to avoid
    replicated code.

    Replaces the interpreter's use of the ad-hock InterpreterForInPrepare
    Runtime function with ForInPrepare in preparation for fixing deopt in
    BytecodeGraphBuilder for ForIn (which will be done in a followup CL).

R=rmcilroy@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=v8:4280
LOG=N
==========

to

==========
PPC: [Interpreter] Add ForInPrepare runtime function which returns a
ObjectTriple.

Port 84f8a506e204b1e70df5b9a8036cc97170e661fd

Original commit message:
    Adds a ForInPrepare Runtime function which returns a triple of
    cache_type, cache_array and cache_length.

    This requires adding support to CEntryStub to call runtime functions
    which return a ObjectTriple - a struct containing three Object*
    pointers. Also did some cleanup of the x64 CEntryStub to avoid
    replicated code.

    Replaces the interpreter's use of the ad-hock InterpreterForInPrepare
    Runtime function with ForInPrepare in preparation for fixing deopt in
    BytecodeGraphBuilder for ForIn (which will be done in a followup CL).

R=rmcilroy@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=v8:4280
LOG=N

Committed: https://crrev.com/b2c246e0a95d377de4c1ba20b8e67ed6c97300e6
Cr-Commit-Position: refs/heads/master@{#33342}
==========

[commit-bot: I haz the power, 2016-01-15 19:06:43]

Patchset 1 (id:??) landed as
https://crrev.com/b2c246e0a95d377de4c1ba20b8e67ed6c97300e6
Cr-Commit-Position: refs/heads/master@{#33342}