PPC: [es6] Introduce spec compliant IsConstructor.

PPC: [es6] Introduce spec compliant IsConstructor.

Port 8fe3ac07014ce5891be0a1cbd8019e9f3b02ff0b

Original commit message:
    There was already a bit on the Map named "function with prototype",
    which basically meant that the Map was a map for a JSFunction that could
    be used as a constructor. Now this CL generalizes that bit to
    IsConstructor, which says that whatever (Heap)Object you are looking at
    can be used as a constructor (i.e. the bit is also set for bound
    functions that can be used as constructors and proxies that have a
    [[Construct]] internal method).

    This way we have a single chokepoint for IsConstructor checking, which
    allows us to get rid of the various ways in which we tried to guess
    whether something could be used as a constructor or not.

    Drive-by-fix: Renamed IsConstructor on FunctionKind to
    IsClassConstructor to resolve the weird name clash, and the
    IsClassConstructor name also matches the spec.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, dstence@us.ibm.com
BUG=v8:4413, v8:4430
LOG=n

Committed: https://crrev.com/623e8021322325cc979a7e32af81627db4bad98b
Cr-Commit-Position: refs/heads/master@{#31027}

[MTBrandyberry, 2015-09-30 16:33:08]

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

[commit-bot: I haz the power, 2015-09-30 16:33:19]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1382673002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1382673002/1

[dstence, 2015-09-30 16:37:50]

lgtm

[commit-bot: I haz the power, 2015-09-30 16:55:17]

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

[commit-bot: I haz the power, 2015-09-30 16:55:17]

Dry run: This issue passed the CQ dry run.

[MTBrandyberry, 2015-09-30 16:59:28]

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

[commit-bot: I haz the power, 2015-09-30 16:59:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1382673002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1382673002/1

[commit-bot: I haz the power, 2015-09-30 17:01:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-30 17:01:26]

Patchset 1 (id:??) landed as
https://crrev.com/623e8021322325cc979a7e32af81627db4bad98b
Cr-Commit-Position: refs/heads/master@{#31027}