PPC: Fix object initialization when slack tracking for it's map is still enabled.

PPC: Fix object initialization when slack tracking for it's map is still enabled.

Port 2fc2cb99f52974d0743610189213a94585c30ac6

Original commit message:
    The old code was not ready for properly initialize objects with non
    standard headers and non zero in-object properties number.

    MacroAssembler::Allocate() implementations now return both start and
    end addresses of the new object (done by parameter renaming).

R=ishell@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/07b50849621348a7f1da4ce8600b68c094ebe900
Cr-Commit-Position: refs/heads/master@{#32182}

[Igor Sheludko, 2015-11-23 07:57:34]

lgtm

https://codereview.chromium.org/1472473003/diff/1/src/ppc/macro-assembler-ppc.cc
File src/ppc/macro-assembler-ppc.cc (left):

https://codereview.chromium.org/1472473003/diff/1/src/ppc/macro-assembler-ppc...
src/ppc/macro-assembler-ppc.cc:2892: InitializeNFieldsWithFiller(start_offset,
r0, filler);
Does it make sense to rewrite InitializeFieldsWithFiller() in a form of
  while (current_address < end_address) {
    *current_address = filler;
    current_address += kPointerSize;
  }
?

BTW, this is the only use of InitializeNFieldsWithFiller() left.

[michael_dawson, 2015-11-23 14:23:25]

On 2015/11/23 07:57:34, Igor Sheludko wrote:
> lgtm
> 
>
https://codereview.chromium.org/1472473003/diff/1/src/ppc/macro-assembler-ppc.cc
> File src/ppc/macro-assembler-ppc.cc (left):
> 
>
https://codereview.chromium.org/1472473003/diff/1/src/ppc/macro-assembler-ppc...
> src/ppc/macro-assembler-ppc.cc:2892: InitializeNFieldsWithFiller(start_offset,
> r0, filler);
> Does it make sense to rewrite InitializeFieldsWithFiller() in a form of
>   while (current_address < end_address) {
>     *current_address = filler;
>     current_address += kPointerSize;
>   }
> ?
> 
> BTW, this is the only use of InitializeNFieldsWithFiller() left.

lgtm

[MTBrandyberry, 2015-11-23 14:38:22]

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

[commit-bot: I haz the power, 2015-11-23 14:38:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1472473003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1472473003/1

[commit-bot: I haz the power, 2015-11-23 15:09:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-23 15:10:06]

Patchset 1 (id:??) landed as
https://crrev.com/07b50849621348a7f1da4ce8600b68c094ebe900
Cr-Commit-Position: refs/heads/master@{#32182}