Optimized querySelector(All) when selector contains #id.

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

Index: PerformanceTests/Parser/query-selector-id-last.html
diff --git a/PerformanceTests/Parser/query-selector-last.html b/PerformanceTests/Parser/query-selector-id-last.html
similarity index 71%
copy from PerformanceTests/Parser/query-selector-last.html
copy to PerformanceTests/Parser/query-selector-id-last.html
index 45c1cdbe9100c474d665bbc4d620a1b5034b5576..e161cd1724438e4a52785b37e23bc4f2f3e37d2c 100644
--- a/PerformanceTests/Parser/query-selector-last.html
+++ b/PerformanceTests/Parser/query-selector-id-last.html
@@ -13,15 +13,13 @@ for (var i = 0; i < 1000; i++) {
 var h1 = document.createElement("h1");
 h1.id = "id";
 h1.className = "class";
-document.body.appendChild(h1);
+document.body.lastChild.appendChild(h1);
 
 PerfTestRunner.measureRunsPerSecond({
-    description: "This benchmark tests querySelector() for an element that appears near the tail of the document",
+    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",
     run: function() {
         for (var i = 0; i < 100; i++) {
-            document.querySelector("h1");
-            document.querySelector("#id");
-            document.querySelector(".class");
+            var res = document.querySelector("#foo999 > h1");
         }
     }});
 </script>