Reland and fix "Allow ICs to be generated for own global proxy."

src/code-stubs-hydrogen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1033 matching lines @@
 
 
 template <>
 HValue* CodeStubGraphBuilder<StoreGlobalStub>::BuildCodeInitializedStub() {
   StoreGlobalStub* stub = casted_stub();
   Handle<Object> hole(isolate()->heap()->the_hole_value(), isolate());
   Handle<Object> placeholer_value(Smi::FromInt(0), isolate());
   Handle<PropertyCell> placeholder_cell =
       isolate()->factory()->NewPropertyCell(placeholer_value);
 
-  HParameter* receiver = GetParameter(0);
   HParameter* value = GetParameter(2);
 
-  // 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();
-  Add<HCheckMaps>(receiver, placeholder_map, top_info());
+  if (stub->check_global()) {
+    // 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();
+    HValue* global = Add<HConstant>(
+        StoreGlobalStub::global_placeholder(isolate()));
+    Add<HCheckMaps>(global, placeholder_map, top_info());
+  }
 
   HValue* cell = Add<HConstant>(placeholder_cell);
   HObjectAccess access(HObjectAccess::ForCellPayload(isolate()));
   HValue* cell_contents = Add<HLoadNamedField>(
       cell, static_cast<HValue*>(NULL), access);
 
   if (stub->is_constant()) {
     IfBuilder builder(this);
     builder.If<HCompareObjectEqAndBranch>(cell_contents, value);
     builder.Then();
@@ skipping 346 matching lines @@
   return BuildRegExpConstructResult(length, index, input);
 }
 
 
 Handle<Code> RegExpConstructResultStub::GenerateCode(Isolate* isolate) {
   return DoGenerateCode(isolate, this);
 }
 
 
 } }  // namespace v8::internal