Revert changes 17962-3 which break Dartium Debug build.

runtime/vm/raw_object_snapshot.cc

Index: runtime/vm/raw_object_snapshot.cc
diff --git a/runtime/vm/raw_object_snapshot.cc b/runtime/vm/raw_object_snapshot.cc
index 8f11d2d142867454acd319838e1fcfd1042230af..8895007245a0d810f6d658a30b00e14d8a374220 100644
--- a/runtime/vm/raw_object_snapshot.cc
+++ b/runtime/vm/raw_object_snapshot.cc
@@ -116,16 +116,50 @@ RawUnresolvedClass* UnresolvedClass::ReadFrom(SnapshotReader* reader,
                                               intptr_t object_id,
                                               intptr_t tags,
                                               Snapshot::Kind kind) {
-  UNREACHABLE();  // Only finalized types are written to a snapshot.
-  return NULL;
+  ASSERT(reader != NULL);
+
+  // Allocate parameterized type object.
+  UnresolvedClass& unresolved_class = UnresolvedClass::ZoneHandle(
+      reader->isolate(), NEW_OBJECT(UnresolvedClass));
+  reader->AddBackRef(object_id, &unresolved_class, kIsDeserialized);
+
+  // Set the object tags.
+  unresolved_class.set_tags(tags);
+
+  // Set all non object fields.
+  unresolved_class.set_token_pos(reader->ReadIntptrValue());
+
+  // Set all the object fields.
+  // TODO(5411462): Need to assert No GC can happen here, even though
+  // allocations may happen.
+  intptr_t num_flds = (unresolved_class.raw()->to() -
+                       unresolved_class.raw()->from());
+  for (intptr_t i = 0; i <= num_flds; i++) {
+    unresolved_class.StorePointer((unresolved_class.raw()->from() + i),
+                                  reader->ReadObjectRef());
+  }
+  return unresolved_class.raw();
 }
 
 
 void RawUnresolvedClass::WriteTo(SnapshotWriter* writer,
                                  intptr_t object_id,
                                  Snapshot::Kind kind) {
-  UNREACHABLE();  // Only finalized types are written to a snapshot.
-  // Specify --error_on_malformed_type flag for details.
+  ASSERT(writer != NULL);
+
+  // Write out the serialization header value for this object.
+  writer->WriteInlinedObjectHeader(object_id);
+
+  // Write out the class and tags information.
+  writer->WriteVMIsolateObject(kUnresolvedClassCid);
+  writer->WriteIntptrValue(writer->GetObjectTags(this));
+
+  // Write out all the non object pointer fields.
+  writer->WriteIntptrValue(ptr()->token_pos_);
+
+  // Write out all the object pointer fields.
+  SnapshotWriterVisitor visitor(writer);
+  visitor.VisitPointers(from(), to());
 }
 
 
@@ -185,11 +219,6 @@ void RawType::WriteTo(SnapshotWriter* writer,
                       Snapshot::Kind kind) {
   ASSERT(writer != NULL);
 
-  // Check that the type is finalized.
-  // Specify --error_on_malformed_type flag for details in case of error.
-  ASSERT((ptr()->type_state_ == RawType::kFinalizedInstantiated) ||
-         (ptr()->type_state_ == RawType::kFinalizedUninstantiated));
-
   // Write out the serialization header value for this object.
   writer->WriteInlinedObjectHeader(object_id);
 
@@ -215,7 +244,7 @@ RawTypeParameter* TypeParameter::ReadFrom(SnapshotReader* reader,
 
   // Allocate type parameter object.
   TypeParameter& type_parameter = TypeParameter::ZoneHandle(
-      reader->isolate(), NEW_OBJECT(TypeParameter));
+          reader->isolate(), NEW_OBJECT(TypeParameter));
   reader->AddBackRef(object_id, &type_parameter, kIsDeserialized);
 
   // Set the object tags.
@@ -245,10 +274,6 @@ void RawTypeParameter::WriteTo(SnapshotWriter* writer,
                                Snapshot::Kind kind) {
   ASSERT(writer != NULL);
 
-  // Check that the type parameter is finalized.
-  // Specify --error_on_malformed_type flag for details in case of error.
-  ASSERT(ptr()->type_state_ == RawTypeParameter::kFinalizedUninstantiated);
-
   // Write out the serialization header value for this object.
   writer->WriteInlinedObjectHeader(object_id);