add type narrowed getters

runtime/Java/src/org/antlr/v4/runtime/Lexer.java

@@ -125,6 +125,8 @@ public abstract class Lexer extends Recognizer<Integer, LexerATNSimulator>
 		getInterpreter().reset();
 	}
 
+	public LexerATNSimulator getInterpreter() { return _interp; }
+
 	/** Return a token from this source; i.e., match a token on the char
 	 *  stream.
 	 */

runtime/Java/src/org/antlr/v4/runtime/Parser.java

@@ -124,6 +124,8 @@ public abstract class Parser extends Recognizer<Token, ParserATNSimulator<Token>
 		}
 	}
 
+	public ParserATNSimulator getInterpreter() { return _interp; }
+
 	/** Match current input symbol against ttype.  Attempt
 	 *  single token insertion or deletion error recovery.  If
 	 *  that fails, throw MismatchedTokenException.