Use reference hash set in reference Holder (#11363)

patches/server/0688-Cache-resource-keys-and-optimize-reference-Holder-ta.patch

@@ -1,9 +1,23 @@
 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: Jake Potrebic <jake.m.potrebic@gmail.com>
 Date: Sun, 20 Mar 2022 22:06:47 -0700
-Subject: [PATCH] cache resource keys
+Subject: [PATCH] Cache resource keys and optimize reference Holder tags set
 
+TagKeys are always interned, so we can use a reference hash set for them
 
+diff --git a/src/main/java/net/minecraft/core/Holder.java b/src/main/java/net/minecraft/core/Holder.java
+index d7bbf60ba94ecd85f991a0c5c70c34fdb00ec9d5..4d2231868b786da9071c3dff2c073b478a486e8a 100644
+--- a/src/main/java/net/minecraft/core/Holder.java
++++ b/src/main/java/net/minecraft/core/Holder.java
+@@ -221,7 +221,7 @@ public interface Holder<T> {
+         }
+ 
+         void bindTags(Collection<TagKey<T>> tags) {
+-            this.tags = Set.copyOf(tags);
++            this.tags = java.util.Collections.unmodifiableSet(new it.unimi.dsi.fastutil.objects.ReferenceOpenHashSet<>(tags)); // Paper
+         }
+ 
+         @Override
 diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBiome.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBiome.java
 index 95b956802f83b583a823fcd24808363775a56842..33d2e89ac40465b0c4633f9c51378b80f7c397a9 100644
 --- a/src/main/java/org/bukkit/craftbukkit/block/CraftBiome.java