Fix spec violations related to regexp.lastIndex

test/mjsunit/regress/regress-2438.js

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-// Flags: --allow-natives-syntax
+function testSideEffects(subject, re) {
+  var counter = 0;
+  var side_effect_object = { valueOf: function() { return counter++; } };
+  re.lastIndex = side_effect_object;
+  re.exec(subject);
+  assertEquals(1, counter);
 
-// Test optimized closures.
+  re.lastIndex = side_effect_object;
+  re.test(subject);
+  assertEquals(2, counter);
 
-var a = new Array(100);
+  re.lastIndex = side_effect_object;
+  subject.match(re);
+  assertEquals(3, counter);
 
-function f() {
-  var x=0;
-  for (var i=0; i<100; i++) {
-    var g = function goo(y) {
-      function h() {
-        if (goo.arguments[0] == 23) return -42;
-        return 42;
-      }
-      return x + y + h(y);
-    }
-    g(0);
-    %OptimizeFunctionOnNextCall(g);
-    a[i] = g(i);
-  }
+  re.lastIndex = side_effect_object;
+  subject.replace(re, "");
+  assertEquals(4, counter);
 }
 
-f();
-assertEquals(42, a[0]);
-assertEquals(49, a[7]);
-assertEquals(-19, a[23]);
+testSideEffects("zzzz", /a/);
+testSideEffects("zzzz", /a/g);
+testSideEffects("xaxa", /a/);
+testSideEffects("xaxa", /a/g);
 
-
-
-