Fix RegistryObject#get allocating on every call

Credit to jaskarth for discovering this problem

forge/src/main/java/org/embeddedt/modernfix/forge/mixin/perf/forge_registry_lambda/RegistryObjectMixin.java

@@ -0,0 +1,30 @@
+package org.embeddedt.modernfix.forge.mixin.perf.forge_registry_lambda;
+
+import net.minecraft.resources.ResourceLocation;
+import net.minecraftforge.fml.RegistryObject;
+import net.minecraftforge.registries.IForgeRegistryEntry;
+import org.jetbrains.annotations.Nullable;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+
+@Mixin(value = RegistryObject.class, remap = false)
+public class RegistryObjectMixin<T extends IForgeRegistryEntry<? super T>> {
+    @Shadow private @Nullable T value;
+
+    @Shadow @Final private ResourceLocation name;
+
+    /**
+     * @author embeddedt
+     * @reason avoid lambda allocation on every call
+     */
+    @Overwrite
+    public T get() {
+        T ret = this.value;
+        if(ret == null) {
+            throw new NullPointerException("Registry Object not present: " + this.name);
+        }
+        return ret;
+    }
+}