[Swift] Make DFA.precedenceDfa be a "let" rather than a "var". #2114
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Make DFA.precedenceDfa be a "let" rather than a "var", and remove setPrecedenceDfa. This field never varies after construction. The code in setPrecedenceDfa was carried over from the Java runtime, but it only threw an exception, and was deprecated. There's no need for that in the Swift runtime.
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Make DFA.precedenceDfa be a "let" rather than a "var", and remove
setPrecedenceDfa. This field never varies after construction. The
code in setPrecedenceDfa was carried over from the Java runtime, but
it only threw an exception, and was deprecated. There's no need for
that in the Swift runtime.