Modifies few gc related layout tests to work with ignition.

third_party/WebKit/LayoutTests/fast/xpath/xpath-other-nodeset-result-should-mark-its-nodeset.html

Index: third_party/WebKit/LayoutTests/fast/xpath/xpath-other-nodeset-result-should-mark-its-nodeset.html
diff --git a/third_party/WebKit/LayoutTests/fast/xpath/xpath-other-nodeset-result-should-mark-its-nodeset.html b/third_party/WebKit/LayoutTests/fast/xpath/xpath-other-nodeset-result-should-mark-its-nodeset.html
index 91bb5968fd134f6a41f4f8f7c5dda77a055c280d..107826627ee9a3ae2d11a8de0023ee3337e87391 100644
--- a/third_party/WebKit/LayoutTests/fast/xpath/xpath-other-nodeset-result-should-mark-its-nodeset.html
+++ b/third_party/WebKit/LayoutTests/fast/xpath/xpath-other-nodeset-result-should-mark-its-nodeset.html
@@ -20,9 +20,16 @@
 
         function test(type)
         {
-            document.getElementsByTagName("span")[0].foo = "PASS";
-            var result = document.evaluate("//span", document.documentElement, null, type, null);
-            document.body.removeChild(document.getElementsByTagName("span")[0]);
+            var result;
+            function initialize() {
+                document.getElementsByTagName("span")[0].foo = "PASS";
+                result = document.evaluate("//span", document.documentElement, null, type, null);
+                document.body.removeChild(document.getElementsByTagName("span")[0]);
+            }
+
+            // Perform all assignments in a function to avoid references to objects
+            // in dead registers when using ignition (chromium:595672)
+            initialize();
             gc();
             var console = document.getElementById("console");
             console.appendChild(document.createTextNode(result.singleNodeValue.foo));