Prevent functions marked as simple from being marked as constructors as well.

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asCtor allows simple functions and constructors to appear after new.

But caja.def calls ctor, which used to prohibit simple functions in the
first position.  (The check was removed in metaweta/attached-methods.) 
This leaves the possibility that a function might be marked both as a
contructor and a simple function, which messes with the function species table:
  http://code.google.com/p/google-caja/wiki/FunctionSpecies

Original issue reported on code.google.com by metaw...@gmail.com on 24 Apr 2008 at 5:17

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Original comment by mikesamuel@gmail.com on 30 May 2008 at 12:56

• Changed state: Started

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Original comment by mikesamuel@gmail.com on 30 May 2008 at 4:19

• Changed state: Pending

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Original comment by mikesamuel@gmail.com on 6 Jun 2008 at 1:38

• Changed state: Fixed