Do not coerce lastIndex of a global RegExp in @@match and @@replace.

test/mjsunit/regress/regress-2438.js

Index: test/mjsunit/regress/regress-2438.js
diff --git a/test/mjsunit/regress/regress-2438.js b/test/mjsunit/regress/regress-2438.js
index 7be7e71687ecca4ae9d226075bc3cc2204126202..f694ff8e190765a9782770ef3c9b52c75cada0f0 100644
--- a/test/mjsunit/regress/regress-2438.js
+++ b/test/mjsunit/regress/regress-2438.js
@@ -35,14 +35,6 @@ function testSideEffects(subject, re) {
   re.lastIndex = side_effect_object;
   re.test(subject);
   assertEquals(2, counter);
-
-  re.lastIndex = side_effect_object;
-  subject.match(re);
-  assertEquals(3, counter);
-
-  re.lastIndex = side_effect_object;
-  subject.replace(re, "");
-  assertEquals(4, counter);
 }
 
 testSideEffects("zzzz", /a/);