PPC: [interpreter]: Changes to interpreter builtins for accumulator and register file registers.

PPC: [interpreter]: Changes to interpreter builtins for accumulator and register file registers.

Port 00df60d1c6943a10fb5ca84fce2c017dcd2001f5

Original commit message:
    Makes the following modifications to the interpreter builtins and
    InterpreterAssembler:
     - Adds an accumulator register and initializes it to undefined()
     - Adds a register file pointer register and use it instead of FramePointer to
       access registers
     - Modifies builtin to support functions with 0 regiters in the register file
     - Modifies builtin to Call rather than TailCall to first bytecode handler.

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/f481316b1463597b265c3aa92a44dfe7abbe3c19
Cr-Commit-Position: refs/heads/master@{#30414}

[dstence, 2015-08-27 13:38:11]

lgtm

[MTBrandyberry, 2015-08-27 13:42:25]

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

[commit-bot: I haz the power, 2015-08-27 13:42:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1309113003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1309113003/1

[commit-bot: I haz the power, 2015-08-27 14:23:27]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-27 14:23:47]

Patchset 1 (id:??) landed as
https://crrev.com/f481316b1463597b265c3aa92a44dfe7abbe3c19
Cr-Commit-Position: refs/heads/master@{#30414}