- Refactor Symbol allocation to expect a thread parameter.

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 cf81ac6c6b78111cf482e6fa6c7a1dbf101e0a0e..0ca54d8f33c2282146cd312db1cc2547aa36f4cf 100644
--- a/runtime/vm/raw_object_snapshot.cc
+++ b/runtime/vm/raw_object_snapshot.cc
@@ -2518,7 +2518,7 @@ void String::ReadFromImpl(SnapshotReader* reader,
     for (intptr_t i = 0; i < len; i++) {
       ptr[i] = reader->Read<CharacterType>();
     }
-    *str_obj ^= (*new_symbol)(ptr, len);
+    *str_obj ^= (*new_symbol)(reader->thread(), ptr, len);
   } else {
     // Set up the string object.
     *str_obj = StringType::New(len, HEAP_SPACE(kind));