PPC: [runtime] Fix ES6 9.2.1 [[Call]] when encountering a classConstructor.

PPC: [runtime] Fix ES6 9.2.1 [[Call]] when encountering a classConstructor.

Port ab84025977fb94bebf7d4d83b874da5a6c1c6293

Also:
- Fix big-endian compiler hints BYTE_OFFSET macro.
- Clean up PPC code access to compiler hints -- which required some new
  SharedFunctionInfo fields to encapsulate kCompilerHintsSmiTagSize.

Original commit message:
    The current implementation of classes throws the TypeError at the wrong
    point, after activating a new context when directly calling a class
    constructor. According to the spec, the TypeError has to be thrown
    in the caller context.

R=bmeurer@chromium.org, cbruni@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, dstence@us.ibm.com
LOG=N
BUG=v8:4428
Committed: https://crrev.com/6413ef4e632e425195beb4ab0ceefe3b308c51e9
Cr-Commit-Position: refs/heads/master@{#31831}

[MTBrandyberry, 2015-11-04 19:43:31]

Contains common-code changes.

[MTBrandyberry, 2015-11-04 19:45:54]

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

[commit-bot: I haz the power, 2015-11-04 19:46:01]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1423713014/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1423713014/1

[commit-bot: I haz the power, 2015-11-04 20:19:05]

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

[commit-bot: I haz the power, 2015-11-04 20:19:06]

Dry run: This issue passed the CQ dry run.

[Benedikt Meurer, 2015-11-05 02:46:16]

lgtm

[Camillo Bruni, 2015-11-05 11:34:42]

lgtm

[MTBrandyberry, 2015-11-05 14:19:44]

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

[commit-bot: I haz the power, 2015-11-05 14:19:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1423713014/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1423713014/1

[commit-bot: I haz the power, 2015-11-05 14:21:48]

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

[commit-bot: I haz the power, 2015-11-05 14:21:50]

Try jobs failed on following builders:
  v8_presubmit on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_presubmit/builds/7476)

[MTBrandyberry, 2015-11-05 14:32:06]

Patchset #2 (id:20001) has been deleted

[MTBrandyberry, 2015-11-05 14:33:37]

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

[MTBrandyberry, 2015-11-05 14:33:37]

The patchset sent to the CQ was uploaded after l-g-t-m from cbruni@chromium.org,
bmeurer@chromium.org
Link to the patchset: https://codereview.chromium.org/1423713014/#ps40001
(title: "Rebase")

[commit-bot: I haz the power, 2015-11-05 14:33:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1423713014/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1423713014/40001

[commit-bot: I haz the power, 2015-11-05 14:51:42]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2015-11-05 14:51:57]

Patchset 2 (id:??) landed as
https://crrev.com/6413ef4e632e425195beb4ab0ceefe3b308c51e9
Cr-Commit-Position: refs/heads/master@{#31831}