[turbofan]: Integrate basic type feedback for property accesses.

src/types.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <iomanip>
 
 #include "src/types.h"
 
 #include "src/ostreams.h"
 #include "src/types-inl.h"
@@ skipping 249 matching lines @@
     case MAP_TYPE:
       // When compiling stub templates, the meta map is used as a place holder
       // for the actual map with which the template is later instantiated.
       // We treat it as a kind of type variable whose upper bound is Any.
       // TODO(rossberg): for caching of CompareNilIC stubs to work correctly,
       // we must exclude Undetectable here. This makes no sense, really,
       // because it means that the template isn't actually parametric.
       // Also, it doesn't apply elsewhere. 8-(
       // We ought to find a cleaner solution for compiling stubs parameterised
       // over type or class variables, esp ones with bounds...
-      return kDetectable;
+      return kDetectable & kTaggedPointer;
     case DECLARED_ACCESSOR_INFO_TYPE:
     case EXECUTABLE_ACCESSOR_INFO_TYPE:
     case SHARED_FUNCTION_INFO_TYPE:
     case ACCESSOR_PAIR_TYPE:
     case FIXED_ARRAY_TYPE:
     case BYTE_ARRAY_TYPE:
     case FOREIGN_TYPE:
     case SCRIPT_TYPE:
     case CODE_TYPE:
       return kInternal & kTaggedPointer;
@@ skipping 1079 matching lines @@
 template class TypeImpl<HeapTypeConfig>::Iterator<i::Object>;
 
 template TypeImpl<ZoneTypeConfig>::TypeHandle
   TypeImpl<ZoneTypeConfig>::Convert<HeapType>(
     TypeImpl<HeapTypeConfig>::TypeHandle, TypeImpl<ZoneTypeConfig>::Region*);
 template TypeImpl<HeapTypeConfig>::TypeHandle
   TypeImpl<HeapTypeConfig>::Convert<Type>(
     TypeImpl<ZoneTypeConfig>::TypeHandle, TypeImpl<HeapTypeConfig>::Region*);
 
 } }  // namespace v8::internal