Tests for GuardField length check along with bug fixes

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
diff --git a/runtime/vm/raw_object.h b/runtime/vm/raw_object.h
index 1be013cb90ce10a14859763dfce7f29b42dad0b7..0c0aec896986a2c96ce7b544a3e6d93a5edc3a33 100644
--- a/runtime/vm/raw_object.h
+++ b/runtime/vm/raw_object.h
@@ -680,6 +680,7 @@ class RawField : public RawObject {
   RawAbstractType* type_;
   RawInstance* value_;  // Offset in words for instance and value for static.
   RawArray* dependent_code_;
+  RawSmi* guarded_list_length_;
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->dependent_code_);

[srdjan, 2013/08/27 17:45:22]

To be correct, 'to()' should go up to guarded_list_length_ instead of to
dependent_code_ only.

[Cutch, 2013/08/28 12:24:59]

Done.

   }
@@ -688,7 +689,6 @@ class RawField : public RawObject {
   intptr_t guarded_cid_;
   intptr_t is_nullable_;  // kNullCid if field can contain null value and
                           // any other value otherwise.
-  intptr_t guarded_list_length_;
   uint8_t kind_bits_;  // static, final, const, has initializer.
 };