Support verified heap pointer writes on ia32.

runtime/vm/verified_memory.h

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_VERIFIED_MEMORY_H_
 #define VM_VERIFIED_MEMORY_H_
 
 #include "vm/allocation.h"
 #include "vm/flags.h"
 #include "vm/virtual_memory.h"
@@ skipping 63 matching lines @@
   // In release mode, most code in this class is optimized away.
   static bool enabled() { return false; }
   static intptr_t offset() { UNREACHABLE(); return -1; }
   static VirtualMemory* ReserveInternal(intptr_t size) {
     UNREACHABLE();
     return NULL;
   }
 #endif
 
   friend class Assembler;  // To use enabled/offset when generating code.
+  friend class FlowGraphCompiler;  // To compute edge counter code size.
+  friend class Intrinsifier;  // To know whether a jump is near or far.
 };
 
 }  // namespace dart
 
 #endif  // VM_VERIFIED_MEMORY_H_