tree e1883da769411502e0fa1e7bef3255304e8edc28
parent d95db6e7a418f6e2836704902636039f2f7685c7
author QUICHE team <quiche-dev@google.com> 1645213920 -0800
committer Copybara-Service <copybara-worker@google.com> 1645214037 -0800

Migrates the underlying representation of QuicheLinkedHashMap from absl::node_hash_map to absl::flat_hash_map.

Pointer stability is not required in this case, and absl::flat_hash_map generally has better performance characteristics.

All QUICHE tests:
  http://sponge2/2786a308-bae7-4b32-81e4-da322d534f7f

All QUICHE tests with --config=asan:
  http://sponge2/1575e0be-3ae6-4b97-a5ee-932b2581509a

Protected by not practical to flag protect.

PiperOrigin-RevId: 429615873