Complete implementation of bounds checking in the vm, by introducing a vm object

runtime/vm/snapshot.h

Index: runtime/vm/snapshot.h
===================================================================
--- runtime/vm/snapshot.h	(revision 19513)
+++ runtime/vm/snapshot.h	(working copy)
@@ -34,6 +34,7 @@
 class RawApiError;
 class RawArray;
 class RawBigint;
+class RawBoundedType;
 class RawClass;
 class RawContext;
 class RawDouble;
@@ -255,6 +256,7 @@
   RawUnresolvedClass* NewUnresolvedClass();
   RawType* NewType();
   RawTypeParameter* NewTypeParameter();
+  RawBoundedType* NewBoundedType();
   RawPatchClass* NewPatchClass();
   RawClosureData* NewClosureData();
   RawRedirectionData* NewRedirectionData();
@@ -328,6 +330,7 @@
 
   friend class ApiError;
   friend class Array;
+  friend class BoundedType;
   friend class Class;
   friend class Context;
   friend class ContextScope;