Early return false after VariadicPlaceholder check on CallLike::isFirstClassCallable() (#924)

VariadicPlaceholder can only occur as the first (and only) argument, so avoid a loop to check fo

Early return false after VariadicPlaceholder check on CallLike::isFirstClassCallable() (#924)

VariadicPlaceholder can only occur as the first (and only) argument, so avoid a loop to check for it.

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Add CallLike parent class

This provides a helper to determine whether a call is a first-class
callable, and a way to strip the args type to Arg[] if it isn't.