add dropped local var after decompilation in AgeableMob#ageUp

Known vineflower problem, see: Vineflower/vineflower#452 for more infos

Author: Lulu13022002

paper-server/patches/sources/net/minecraft/server/network/ServerGamePacketListenerImpl.java.patch

@@ -274,7 +274,7 @@
                  }
 
                  rootVehicle.move(MoverType.PLAYER, new Vec3(d3, d4, d5));
-+                double verticalDelta = d4; // Paper - Decompile fix, was named d11 previously, is now gone in the source
++                double verticalDelta = d4; // Paper - Decompile fix: lvt reassignment lost
                  d3 = d - rootVehicle.getX();
                  d4 = d1 - rootVehicle.getY();
                  if (d4 > -0.5 || d4 < 0.5) {
@@ -851,7 +851,7 @@
 +                                    return; // ... thanks Mojang for letting move calls teleport across dimensions.
 +                                }
 +                                // Paper end - prevent position desync
-+                                double verticalDelta = d4; // Paper - Decompile fix, was named d11 previously, is now gone in the source
++                                double verticalDelta = d4; // Paper - Decompile fix: lvt reassignment lost
                                  d3 = d - this.player.getX();
                                  d4 = d1 - this.player.getY();
                                  if (d4 > -0.5 || d4 < 0.5) {

paper-server/patches/sources/net/minecraft/world/entity/AgeableMob.java.patch

@@ -8,14 +8,23 @@
 
      protected AgeableMob(EntityType<? extends AgeableMob> entityType, Level level) {
          super(entityType, level);
-@@ -68,6 +_,7 @@
+@@ -68,13 +_,15 @@
      }
 
      public void ageUp(int amount, boolean forced) {
 +        if (this.ageLocked) return; // Paper - Honor ageLock
          int age = this.getAge();
++        int previousAge = age; // Paper - Decompile fix: lvt reassignment lost
          age += amount * 20;
          if (age > 0) {
+             age = 0;
+         }
+ 
+-        int i1 = age - age;
++        int i1 = age - previousAge; // Paper - Decompile fix
+         this.setAge(age);
+         if (forced) {
+             this.forcedAge += i1;
 @@ -106,6 +_,7 @@
          super.addAdditionalSaveData(compound);
          compound.putInt("Age", this.getAge());