PPC: [Interpreter] Add support for parameter variables.

PPC: [Interpreter] Add support for parameter variables.

Port 5d975694e4d3ecf66716cc5395d4d10c9730f9dd

Original commit message:
    Adds support for parameters to the BytecodeArrayBuilder and BytecodeGenerator.
    Parameters are accessed as negative interpreter registers.

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

Committed: https://crrev.com/ae781735b4567290d7069e14b4edb990ce81d94d
Cr-Commit-Position: refs/heads/master@{#30424}

[JoranSiu, 2015-08-27 16:48:02]

lgtm

[MTBrandyberry, 2015-08-27 16:48:30]

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

[commit-bot: I haz the power, 2015-08-27 16:48:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1308373003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1308373003/1

[commit-bot: I haz the power, 2015-08-27 17:12:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-27 17:13:11]

Patchset 1 (id:??) landed as
https://crrev.com/ae781735b4567290d7069e14b4edb990ce81d94d
Cr-Commit-Position: refs/heads/master@{#30424}