Eliminate map checks of constant values.

src/code-stubs-hydrogen.cc

Index: src/code-stubs-hydrogen.cc
diff --git a/src/code-stubs-hydrogen.cc b/src/code-stubs-hydrogen.cc
index 21b034100b64cd36ddf37ae3e406f3980967b181..6da61445901615c024c0ebfbdcaf7ec70ecbb94d 100644
--- a/src/code-stubs-hydrogen.cc
+++ b/src/code-stubs-hydrogen.cc
@@ -853,7 +853,8 @@ HValue* CodeStubGraphBuilder<StoreGlobalStub>::BuildCodeInitializedStub() {
   // Check that the map of the global has not changed: use a placeholder map
   // that will be replaced later with the global object's map.
   Handle<Map> placeholder_map = isolate()->factory()->meta_map();
-  AddInstruction(HCheckMaps::New(receiver, placeholder_map, zone()));
+  AddInstruction(HCheckMaps::New(
+      receiver, placeholder_map, zone(), top_info()));
 
   HValue* cell = Add<HConstant>(placeholder_cell, Representation::Tagged());
   HObjectAccess access(HObjectAccess::ForCellPayload(isolate()));