Split test/mjsunit/fuzz-natives into smaller chunks

test/mjsunit/fuzz-natives-part1.js

Index: test/mjsunit/fuzz-natives-part1.js
diff --git a/test/mjsunit/fuzz-natives.js b/test/mjsunit/fuzz-natives-part1.js
similarity index 98%
copy from test/mjsunit/fuzz-natives.js
copy to test/mjsunit/fuzz-natives-part1.js
index 225a44d8a514a665d2d89d3f7d9ca6b01fb022c2..6941d806cc4fc027b0cf52bbccb7ef9a2b216cd9 100644
--- a/test/mjsunit/fuzz-natives.js
+++ b/test/mjsunit/fuzz-natives-part1.js
@@ -205,7 +205,9 @@ var currentlyUncallable = {
 
 function testNatives() {
   var allNatives = %ListNatives();
-  for (var i = 0; i < allNatives.length; i++) {
+  var start = 0;
+  var stop = (allNatives.length >> 2);
+  for (var i = start; i < stop; i++) {
     var nativeInfo = allNatives[i];
     var name = nativeInfo[0];
     if (name in knownProblems || name in currentlyUncallable)