Add Array.prototype.reduce and .reduceRight.

test/mjsunit/mjsunit.js

Index: test/mjsunit/mjsunit.js
diff --git a/test/mjsunit/mjsunit.js b/test/mjsunit/mjsunit.js
index 370d491f8f9c66f6e39747b690673bd8511716ac..320e8d15d360e23daa3e88ff257b35b628c49080 100644
--- a/test/mjsunit/mjsunit.js
+++ b/test/mjsunit/mjsunit.js
@@ -53,6 +53,9 @@ function fail(expected, found, name_opt) {
 
 function deepEquals(a, b) {
   if (a == b) return true;
+  if (typeof a == "number" && typeof b == "number" && isNaN(a) && isNaN(b)) {
+    return true;
+  }
   if ((typeof a) !== 'object' || (typeof b) !== 'object' ||
       (a === null) || (b === null))
     return false;