ARM: Track Smis on top 4 stack positions and Smi loop variables....

src/type-info.h

 // Copyright 2010 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 29 matching lines @@
 //         Number      String
 //         /    |         |
 //    Double  Integer32   |
 //        |      |       /
 //        |     Smi     /
 //        |     /      /
 //        Uninitialized.
 
 class TypeInfo {
  public:
-  TypeInfo() { }
+  TypeInfo() : type_(kUnknownType) { }
 
   static inline TypeInfo Unknown();
   // We know it's a primitive type.
   static inline TypeInfo Primitive();
   // We know it's a number of some sort.
   static inline TypeInfo Number();
   // We know it's signed or unsigned 32 bit integer.
   static inline TypeInfo Integer32();
   // We know it's a Smi.
   static inline TypeInfo Smi();
@@ skipping 174 matching lines @@
 }
 
 
 TypeInfo TypeInfo::Uninitialized() {
   return TypeInfo(kUninitializedType);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TYPE_INFO_H_