[Java vs CSharp runtime] Different args to constructor for ParserATNInterpreter

This code in C# have null passed for the 3rd and 4th args. https://github.com/antlr/antlr4/blob/d25d421780286e3de0714831a5f82eca59234249/runtime/CSharp/src/Parser.cs#L1202

This code in Java *do not have* null passed for the 3rd and 4th args. https://github.com/antlr/antlr4/blob/d25d421780286e3de0714831a5f82eca59234249/runtime/Java/src/org/antlr/v4/runtime/Parser.java#L923

This is inconsistent. It is not clear off hand why they are different, and whether they end up doing the same thing in the constructor. But, this code doesn't look right.

Compare the constructor call sites in runtime/CSharp/src/Parser.cs around line 1202 and runtime/Java/src/org/antlr/v4/runtime/Parser.java around line 923. Start by reading the ParserATNInterpreter constructor and checking what the third and fourth arguments represent in each runtime. Done means the calls are shown to be equivalent, corrected for consistency, or their intentional difference is documented.

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