Support check mode for statics.

lib/compiler/implementation/ssa/builder.dart

Index: lib/compiler/implementation/ssa/builder.dart
===================================================================
--- lib/compiler/implementation/ssa/builder.dart	(revision 12037)
+++ lib/compiler/implementation/ssa/builder.dart	(working copy)
@@ -898,7 +898,9 @@
     Link<Node> link = node.arguments;
     assert(!link.isEmpty() && link.tail.isEmpty());
     visit(link.head);
-    close(new HReturn(pop())).addSuccessor(graph.exit);
+    HInstruction value = pop();
+    value = potentiallyCheckType(value, variable);
+    close(new HReturn(value)).addSuccessor(graph.exit);
     graph.finalize();
     return graph;
   }
@@ -2077,6 +2079,7 @@
         add(target);
         addWithPosition(new HInvokeStatic(<HInstruction>[target, value]), send);
       } else {
+        value = potentiallyCheckType(value, element);
         addWithPosition(new HStaticStore(element, value), send);
       }
       stack.add(value);