Add fast path for querySelector(All)

PerformanceTests/Parser/query-selector-all-id-last.html

Index: PerformanceTests/Parser/query-selector-all-id-last.html
diff --git a/PerformanceTests/Parser/query-selector-id-last.html b/PerformanceTests/Parser/query-selector-all-id-last.html
similarity index 69%
copy from PerformanceTests/Parser/query-selector-id-last.html
copy to PerformanceTests/Parser/query-selector-all-id-last.html
index e161cd1724438e4a52785b37e23bc4f2f3e37d2c..8040f9b49a43e9ecf52b53afead1d5220574d42d 100644
--- a/PerformanceTests/Parser/query-selector-id-last.html
+++ b/PerformanceTests/Parser/query-selector-all-id-last.html
@@ -16,10 +16,10 @@ h1.className = "class";
 document.body.lastChild.appendChild(h1);
 
 PerfTestRunner.measureRunsPerSecond({
-    description: "This benchmark tests querySelector() for an element that appears near the tail of the document, and is a child of an element with a given id",
+    description: "This benchmark tests querySelectorAll() for an element that appears near the tail of the document, and is a child of an element with a given id",
     run: function() {
         for (var i = 0; i < 100; i++) {
-            var res = document.querySelector("#foo999 > h1");
+            var res = document.querySelectorAll("#foo999 > h1");
         }
     }});
 </script>