Revert of [wasm] reuse the first compiled module

src/snapshot/code-serializer.h

Index: src/snapshot/code-serializer.h
diff --git a/src/snapshot/code-serializer.h b/src/snapshot/code-serializer.h
index e67cd17665bd912196b999962fb48760ea0e601e..e82a7d5dd6d5787582263f850981e0988d3f8b22 100644
--- a/src/snapshot/code-serializer.h
+++ b/src/snapshot/code-serializer.h
@@ -36,7 +36,6 @@
     UNREACHABLE();
   }
 
-  virtual bool SkipOver(Object* obj) { return false; }
   void SerializeGeneric(HeapObject* heap_object, HowToCode how_to_code,
                         WhereToPoint where_to_point);
 
@@ -73,8 +72,6 @@
       UNREACHABLE();
     }
   }
-
-  bool SkipOver(Object* obj) override { return obj->IsWeakCell(); };
 
  private:
   WasmCompiledModuleSerializer(Isolate* isolate, uint32_t source_hash)