Refactor ReadObjectImpl to use the as_reference field and eliminate ReadObjectRef and ReadInlinedOb…

runtime/vm/snapshot.h

Index: runtime/vm/snapshot.h
diff --git a/runtime/vm/snapshot.h b/runtime/vm/snapshot.h
index 0ad1b894329a6a798de83ede4ab32919d72b93d9..14360a4de7ba0d12c88d3d989791a85f2b25c2e4 100644
--- a/runtime/vm/snapshot.h
+++ b/runtime/vm/snapshot.h
@@ -485,19 +485,10 @@ class SnapshotReader : public BaseReader {
                             intptr_t patch_object_id,
                             intptr_t patch_offset);
 
-  // Read an object reference from the stream.
-  RawObject* ReadObjectRef(intptr_t object_id,
-                           intptr_t class_header,
-                           intptr_t tags,
-                           intptr_t patch_object_id = kInvalidPatchIndex,
-                           intptr_t patch_offset = 0);
-
-  // Read an inlined object from the stream.
-  RawObject* ReadInlinedObject(intptr_t object_id,
-                               intptr_t class_header,
-                               intptr_t tags,
-                               intptr_t patch_object_id,
-                               intptr_t patch_offset);
+  // Read a Dart Instance object.
+  RawObject* ReadInstance(intptr_t object_id,
+                          intptr_t tags,
+                          bool as_reference);
 
   // Read a VM isolate object that was serialized as an Id.
   RawObject* ReadVMIsolateObject(intptr_t object_id);