Add minimized test case

Author: jirkamarsik

regex/src/com.oracle.truffle.regex.test/src/com/oracle/truffle/regex/tregex/test/JsTests.java

@@ -40,6 +40,7 @@
  */
 package com.oracle.truffle.regex.tregex.test;
 
+import com.oracle.truffle.regex.tregex.TRegexOptions;
 import org.junit.Test;
 
 public class JsTests extends RegexTestBase {
@@ -158,4 +159,9 @@ public void gr21421() {
         test("(?=(\\3?)|([^\\W\uaa3bt-\ua4b9]){4294967296}|(?=[^]+[\\n-\u4568\\uD3D5\\u00ca-\\u00fF]*)*|(?:\\2|^)?.){33554431}(?:(?:\\S{1,}(?:\\b|\\w{1,}))(?:\\2?)+){4,}", "im",
                         "\u4568\u4568\u4568\u4568________\\xee0000", 0, true, 0, 20, 0, 0, -1, -1);
     }
+
+    @Test
+    public void gr37496() {
+        test("(?:(?:" + "a".repeat(TRegexOptions.TRegexMaxParseTreeSizeForDFA) + ")?(?<=a))+", "", "", 0, false);
+    }
 }