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Also, drop AbstractFunction for parent of anonymous subclass of
function type that must have its class spun up at compile time
(rather than at linkage time by LambdaMetaFactory).
This revealed an old problem with typedTemplate, in which
parent types may be normalized at the level of trees,
while this change does not get propagated to the class's info
in time for the constructor to be located when we type check
the primary constructor.
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Thus, rule out traits that have a constructor (which we use
as a proxy for having potentially side-effecting statements),
and create an anonymous subclass for them at compile time.
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LambdaMetaFactory can only properly instantiate Java interfaces
(with one abstract method, of course). A trait always compiles
to an interface, but a subclass that can be instantiated may
require mixing in further members, which LMF cannot do.
(Nested traits, traits with fields,... do not qualify.)
Traits that cannot be instantiated by LMF are still SAM targets,
we simply created anonymous subclasses as before.
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