Port databits from newer version

sources/src/main/java/io/akarin/server/mixin/optimization/MixinDataBits.java

@@ -0,0 +1,47 @@
+package io.akarin.server.mixin.optimization;
+
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+
+import net.minecraft.server.DataBits;
+
+@Mixin(value = DataBits.class, remap = false)
+public abstract class MixinDataBits {
+	@Shadow @Final private long[] a;
+	@Shadow @Final private int b;
+	@Shadow @Final private long c;
+	
+	@Overwrite
+	public void a(int i, int j) {
+        int k = i * this.b;
+        int l = k >> 6;
+        int i1 = (i + 1) * this.b - 1 >> 6;
+        int j1 = k ^ l << 6;
+
+        this.a[l] = this.a[l] & ~(this.c << j1) | ((long) j & this.c) << j1;
+        if (l != i1) {
+            int k1 = 64 - j1;
+            int l1 = this.b - k1;
+
+            this.a[i1] = this.a[i1] >>> l1 << l1 | ((long) j & this.c) >> k1;
+        }
+
+    }
+	@Overwrite
+    public int a(int i) {
+        int j = i * this.b;
+        int k = j >> 6;
+        int l = (i + 1) * this.b - 1 >> 6;
+        int i1 = j ^ k << 6;
+
+        if (k == l) {
+            return (int) (this.a[k] >>> i1 & this.c);
+        } else {
+            int j1 = 64 - i1;
+
+            return (int) ((this.a[k] >>> i1 | this.a[l] << j1) & this.c);
+        }
+    }
+}

sources/src/main/resources/mixins.akarin.core.json

@@ -49,6 +49,7 @@
         "optimization.MixinContainerHorse",
         "optimization.MixinExplosion",
         "optimization.MixinMathHelper",
-        "optimization.MixinBlockStationary"
+        "optimization.MixinBlockStationary",
+        "optimization.MixinDataBits"
     ]
 }