Make SVGResourcesCycleSolver check for cycles beyond one level (and more)

LayoutTests/svg/custom/pattern-3-step-cycle.html

Index: LayoutTests/svg/custom/pattern-3-step-cycle.html
diff --git a/LayoutTests/svg/custom/pattern-content-cycle-w-resourceless-container.html b/LayoutTests/svg/custom/pattern-3-step-cycle.html
similarity index 61%
copy from LayoutTests/svg/custom/pattern-content-cycle-w-resourceless-container.html
copy to LayoutTests/svg/custom/pattern-3-step-cycle.html
index 6602a51d18999e820aa53b940bbe4e60b2d2e660..26d392218d7545de085f7489a461c315c52bb445 100644
--- a/LayoutTests/svg/custom/pattern-content-cycle-w-resourceless-container.html
+++ b/LayoutTests/svg/custom/pattern-3-step-cycle.html
@@ -10,15 +10,14 @@ if (window.testRunner) {
 </script>
 <p>PASS if no crash (stack overflow).</p>
 <svg width="100" height="100">
-  <rect fill="url(#p1)" width="100" height="100"/>
+  <rect width="100" height="100" fill="url(#p1)"/>
+  <pattern id="p3" width="1" height="1">
+    <rect fill="url(#p1)" width="100" height="100"/>
+  </pattern>
   <pattern id="p2" width="1" height="1">
-    <g>
-      <rect fill="url(#p1)" width="100" height="100"/>
-    </g>
+    <rect fill="url(#p3)" width="100" height="100"/>
   </pattern>
   <pattern id="p1" width="1" height="1">
-    <g>
-      <rect fill="url(#p2)" width="100" height="100"/>
-    </g>
+    <rect fill="url(#p2)" width="100" height="100"/>
   </pattern>
 </svg>