Removed the use of Math.random() and new Date() for building...

benchmarks/base.js

Index: benchmarks/base.js
===================================================================
--- benchmarks/base.js	(revision 399)
+++ benchmarks/base.js	(working copy)
@@ -76,6 +76,24 @@
 BenchmarkSuite.version = '2 candidate';
 
 
+// To make the benchmark results predictable, we replace Math.random
+// with a 100% deterministic alternative.
+Math.random = (function() {
+  var seed = 49734321;
+  return function() {
+    // Robert Jenkins' 32 bit integer hash function.
+    seed = ((seed + 0x7ed55d16) + (seed << 12))  & 0xffffffff;
+    seed = ((seed ^ 0xc761c23c) ^ (seed >>> 19)) & 0xffffffff;
+    seed = ((seed + 0x165667b1) + (seed << 5))   & 0xffffffff;
+    seed = ((seed + 0xd3a2646c) ^ (seed << 9))   & 0xffffffff;
+    seed = ((seed + 0xd3a2646c) ^ (seed << 9))   & 0xffffffff;
+    seed = ((seed + 0xfd7046c5) + (seed << 3))   & 0xffffffff;
+    seed = ((seed ^ 0xb55a4f09) ^ (seed >>> 16)) & 0xffffffff;
+    return (seed & 0xfffffff) / 0x10000000;
+  };
+})();
+
+
 // Runs all registered benchmark suites and optionally yields between
 // each individual benchmark to avoid running for too long in the
 // context of browsers. Once done, the final score is reported to the