Ignore testStartRuleWithoutEOF until we decide on the desired behavior

tool/test/org/antlr/v4/test/TestParserExec.java

@@ -30,6 +30,7 @@
 
 package org.antlr.v4.test;
 
+import org.junit.Ignore;
 import org.junit.Test;
 
 import static org.junit.Assert.*;
@@ -286,6 +287,7 @@ public class TestParserExec extends BaseTest {
 	 * This is a regression test for antlr/antlr4#110.
 	 * https://github.com/antlr/antlr4/issues/110
 	 */
+	@Ignore("Performance impact of passing this test may not be worthwhile")
 	@Test public void testStartRuleWithoutEOF() {
 		String grammar =
 			"grammar T;\n"+