Revert "- Use a hash table to canonicalize instances/arrays to avoid having to iterate over a linea…

runtime/vm/raw_object_snapshot.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/native_entry.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/snapshot.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
@@ skipping 2275 matching lines @@
     obj = reader->NewInstance();
     // Set the canonical bit.
     if (RawObject::IsCanonical(tags)) {
       obj.SetCanonical();
     }
   } else {
     obj ^= Object::Allocate(kInstanceCid,
                             Instance::InstanceSize(),
                             HEAP_SPACE(kind));
     if (RawObject::IsCanonical(tags)) {
-      obj = obj.CheckAndCanonicalize(reader->thread(), NULL);
+      obj = obj.CheckAndCanonicalize(NULL);
     }
   }
   reader->AddBackRef(object_id, &obj, kIsDeserialized);
 
   return obj.raw();
 }
 
 
 void RawInstance::WriteTo(SnapshotWriter* writer,
                           intptr_t object_id,
@@ skipping 90 matching lines @@
   // If it is a canonical constant make it one.
   // When reading a full snapshot we don't need to canonicalize the object
   // as it would already be a canonical object.
   // When reading a script snapshot or a message snapshot we always have
   // to canonicalize the object.
   if (RawObject::IsCanonical(tags)) {
     if (kind == Snapshot::kFull) {
       // Set the canonical bit.
       obj.SetCanonical();
     } else {
-      obj ^= obj.CheckAndCanonicalize(reader->thread(), NULL);
+      obj ^= obj.CheckAndCanonicalize(NULL);
       ASSERT(!obj.IsNull());
       ASSERT(obj.IsCanonical());
     }
   }
   return obj.raw();
 }
 
 
 void RawBigint::WriteTo(SnapshotWriter* writer,
                         intptr_t object_id,
@@ skipping 406 matching lines @@
         NEW_OBJECT_WITH_LEN_SPACE(ImmutableArray, len, kind)));
     reader->AddBackRef(object_id, array, state);
   }
   if (!as_reference) {
     // Read all the individual elements for inlined objects.
     reader->ArrayReadFrom(object_id, *array, len, tags);
     if (RawObject::IsCanonical(tags)) {
       if (kind == Snapshot::kFull) {
         array->SetCanonical();
       } else {
-        *array ^= array->CheckAndCanonicalize(reader->thread(), NULL);
+        *array ^= array->CheckAndCanonicalize(NULL);
       }
     }
   }
   return raw(*array);
 }
 
 
 void RawArray::WriteTo(SnapshotWriter* writer,
                        intptr_t object_id,
                        Snapshot::Kind kind,
@@ skipping 395 matching lines @@
   // If it is a canonical constant make it one.
   // When reading a full snapshot we don't need to canonicalize the object
   // as it would already be a canonical object.
   // When reading a script snapshot or a message snapshot we always have
   // to canonicalize the object.
   if (RawObject::IsCanonical(tags)) {
     if (kind == Snapshot::kFull) {
       // Set the canonical bit.
       result.SetCanonical();
     } else {
-      result ^= result.CheckAndCanonicalize(reader->thread(), NULL);
+      result ^= result.CheckAndCanonicalize(NULL);
       ASSERT(!result.IsNull());
       ASSERT(result.IsCanonical());
     }
   }
   return result.raw();
 }
 #undef TYPED_DATA_READ
 
 
 RawExternalTypedData* ExternalTypedData::ReadFrom(SnapshotReader* reader,
@@ skipping 439 matching lines @@
     // We do not allow objects with native fields in an isolate message.
     writer->SetWriteException(Exceptions::kArgument,
                               "Illegal argument in isolate message"
                               " : (object is a UserTag)");
   } else {
     UNREACHABLE();
   }
 }
 
 }  // namespace dart