Fix x64 build.

runtime/vm/disassembler_x64.cc

 // Copyright (c) 2012, 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.
 
 #include "vm/disassembler.h"
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_X64)
 #include "platform/utils.h"
 #include "vm/allocation.h"
@@ skipping 820 matching lines @@
     AppendToBuffer("  '%s'", ObjectToCStringNoGC(obj));
   } else {
     // 'addr' is not an object, but probably a code address.
     const char* name_of_stub = StubCode::NameOfStub(addr);
     if (name_of_stub != NULL) {
       AppendToBuffer("  [stub: %s]", name_of_stub);
     } else {
       // Print only if jumping to entry point.
       const Code& code = Code::Handle(Code::LookupCode(addr));
       if (!code.IsNull() && (code.EntryPoint() == addr)) {
-        const String& name = String::Handle(code.UserName());
+        const String& name = String::Handle(code.PrettyName());
         const char* name_c = name.ToCString();
         AppendToBuffer(" [%s]", name_c);
       }
     }
   }
 }
 
 
 // Returns number of bytes used, including *data.
 int DisassemblerX64::JumpShort(uint8_t* data) {
@@ skipping 1115 matching lines @@
                                   pc);
     pc += instruction_length;
   }
 
   return;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64