v4: Fix Parser.reset (side effect fixes Parser.setInputStream)

[git-p4: depot-paths = "//depot/code/antlr4/main/": change = 9491]

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

@@ -79,6 +79,11 @@ public abstract class BaseRecognizer<Symbol> extends Recognizer<Symbol, ParserAT
 		if ( getInputStream()!=null ) getInputStream().seek(0);
 		_errHandler.endErrorCondition(this);
 		_ctx = null;
+		syntaxErrors = 0;
+		ParserATNSimulator<?> interpreter = getInterpreter();
+		if (interpreter != null) {
+			interpreter.reset();
+		}
 	}
 
 	/** Match current input symbol against ttype.  Attempt

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

@@ -39,14 +39,6 @@ public class Parser extends BaseRecognizer<Token> {
 		super(input);
     }
 
-	@Override
-	public void reset() {
-		super.reset(); // reset all recognizer state variables
-		if ( _input !=null ) {
-			_input.seek(0); // rewind the input
-		}
-	}
-
 	/** Always called by generated parsers upon entry to a rule.
 	 *  This occurs after the new context has been pushed. Access field
 	 *  _ctx get the current context.

runtime/Java/src/org/antlr/v4/runtime/atn/ParserATNSimulator.java

@@ -116,6 +116,13 @@ public class ParserATNSimulator<Symbol> extends ATNSimulator {
 		}
 	}
 
+	public void reset() {
+		userWantsCtxSensitive = false;
+		outerContext = RuleContext.EMPTY;
+		prevAccept = null;
+		prevAcceptIndex = -1;
+	}
+
 	public int predictATN(@NotNull DFA dfa, @NotNull SymbolStream<Symbol> input,
 						  @Nullable RuleContext outerContext,
 						  boolean useContext)