Type predicates cannot be unions #5977
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And refactor checkSignatureDeclaration to call checkTypePredicate instead of duplicating its code.
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Add union type checking to checkTypePredicate and refactor
checkSignatureDeclarationto callcheckTypePredicateviacheckSourceElement.The new code is at the end of
checkTypePredicate. I forgot to change the branch name -- what this really does is disallow the type of the type predicate from being a union that itself contains type predicates.Fixes #5903.