Revert of [es6] Introduce spec compliant IsConstructor.

Revert of [es6] Introduce spec compliant IsConstructor. (patchset #2 id:20001 of https://codereview.chromium.org/1358423002/ )

Reason for revert:
Failed on Fuzzer and MIPS bot.

Original issue's description:
> [es6] Introduce spec compliant IsConstructor.
>
> 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=jarin@chromium.org, rossberg@chromium.org
> BUG=v8:4430
> LOG=n
>
> Committed: https://crrev.com/8de4d9351df4cf66c8a128d561a6e331d196be54
> Cr-Commit-Position: refs/heads/master@{#30900}

TBR=jarin@chromium.org,rossberg@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4430
Committed: https://crrev.com/656ebdce8d2cfa1ba1d37686b20785321f1874b9
Cr-Commit-Position: refs/heads/master@{#30901}

[Benedikt Meurer, 2015-09-24 05:26:20]

Created Revert of [es6] Introduce spec compliant IsConstructor.

[commit-bot: I haz the power, 2015-09-24 05:26:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1360403002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1360403002/1

[commit-bot: I haz the power, 2015-09-24 05:26:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-24 05:27:11]

Patchset 1 (id:??) landed as
https://crrev.com/656ebdce8d2cfa1ba1d37686b20785321f1874b9
Cr-Commit-Position: refs/heads/master@{#30901}