Revert of [turbofan] Ship TurboFan with new.target references. (patchset #1...

Revert of [turbofan] Ship TurboFan with new.target references. (patchset #1 id:1 of https://codereview.chromium.org/1482733002/ )

Reason for revert:
Tanks sunspider/date-format-tofte because of the Date constructor being turbofanned.

Original issue's description:
> [turbofan] Ship TurboFan with new.target references.
>
> This correctly marks functions containing a new.target reference as
> being disabled with Crankshaft, which would have bailed out anyways.
> Also note that this will trigger TurboFan for such functions and hence
> widens the TurboFan intake valve.
>
> R=bmeurer@chromium.org
>
> Committed: https://crrev.com/2ec6fcd1520bb8a09c9924ac5498eb9b437670b0
> Cr-Commit-Position: refs/heads/master@{#32444}

TBR=bmeurer@chromium.org,rossberg@chromium.org,hablich@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1489833002

Cr-Commit-Position: refs/heads/master@{#32455}

src/ast/ast-numbering.cc

@@ -571,7 +571,6 @@ bool AstNumberingVisitor::Renumber(FunctionLiteral* node) {
     DisableOptimization(kFunctionWithIllegalRedeclaration);
     return Finish(node);
   }
-  if (scope->new_target_var()) DisableCrankshaft(kSuperReference);
   if (scope->calls_eval()) DisableOptimization(kFunctionCallsEval);
   if (scope->arguments() != NULL && !scope->arguments()->IsStackAllocated()) {
     DisableCrankshaft(kContextAllocatedArguments);