Support untagged object pool entries.

runtime/vm/compiler.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/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 849 matching lines @@
       ISL_Print("%4" Pd ": 0x%" Px "  %s  (%s)\n",
                 i,
                 start + offset.Value(),
                 DeoptInfo::ToCString(deopt_table, info),
                 DeoptReasonToCString(
                     static_cast<ICData::DeoptReasonId>(reason)));
     }
     ISL_Print("}\n");
   }
 
-  const Array& object_pool = Array::Handle(code.ObjectPool());
-  if (object_pool.Length() > 0) {
-    ISL_Print("Object Pool: {\n");
-    for (intptr_t i = 0; i < object_pool.Length(); i++) {
-      ISL_Print("  %" Pd ": %s\n", i,
-          Object::Handle(object_pool.At(i)).ToCString());
-    }
-    ISL_Print("}\n");
-  }
+  const ObjectPool& object_pool = ObjectPool::Handle(code.GetObjectPool());
+  object_pool.DebugPrint();
 
   ISL_Print("Stackmaps for function '%s' {\n", function_fullname);
   if (code.stackmaps() != Array::null()) {
     const Array& stackmap_table = Array::Handle(code.stackmaps());
     Stackmap& map = Stackmap::Handle();
     for (intptr_t i = 0; i < stackmap_table.Length(); ++i) {
       map ^= stackmap_table.At(i);
       ISL_Print("%s\n", map.ToCString());
     }
   }
@@ skipping 417 matching lines @@
     const Object& result =
       PassiveObject::Handle(isolate->object_store()->sticky_error());
     isolate->object_store()->clear_sticky_error();
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 }  // namespace dart