tools: fix mkcodecache when run with ASAN

Fixes: #32835

PR-URL: #32850
Backport-PR-URL: #33128
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

tools/code_cache/mkcodecache.cc

@@ -49,8 +49,9 @@ int main(int argc, char* argv[]) {
 
   // Create a new Isolate and make it the current one.
   Isolate::CreateParams create_params;
-  create_params.array_buffer_allocator =
-      ArrayBuffer::Allocator::NewDefaultAllocator();
+  std::unique_ptr<ArrayBuffer::Allocator> array_buffer_allocator {
+      ArrayBuffer::Allocator::NewDefaultAllocator() };
+  create_params.array_buffer_allocator = array_buffer_allocator.get();
   Isolate* isolate = Isolate::New(create_params);
   {
     Isolate::Scope isolate_scope(isolate);
@@ -65,6 +66,7 @@ int main(int argc, char* argv[]) {
     out << cache;
     out.close();
   }
+  isolate->Dispose();
 
   v8::V8::ShutdownPlatform();
   return 0;