cache: fix assembler to set correct switch table index

The int operand of switch instructions is an index into the switch table. The operand was always 0, breaking scripts with multiple switches.

cache/src/main/java/net/runelite/cache/script/assembler/ScriptWriter.java

@@ -32,6 +32,7 @@ import java.util.Objects;
 import net.runelite.cache.definitions.ScriptDefinition;
 import net.runelite.cache.script.Instruction;
 import net.runelite.cache.script.Instructions;
+import net.runelite.cache.script.Opcodes;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -216,6 +217,8 @@ public class ScriptWriter extends rs2asmBaseListener
 
 	public ScriptDefinition buildScript()
 	{
+		setSwitchOperands();
+
 		ScriptDefinition script = new ScriptDefinition();
 		script.setId(id);
 		script.setIntStackCount(intStackCount);
@@ -232,6 +235,20 @@ public class ScriptWriter extends rs2asmBaseListener
 		return script;
 	}
 
+	private void setSwitchOperands()
+	{
+		int count = 0;
+		for (int i = 0; i < opcodes.size(); ++i)
+		{
+			if (opcodes.get(i) != Opcodes.SWITCH)
+			{
+				continue;
+			}
+
+			iops.set(i, count++);
+		}
+	}
+
 	private Map<Integer, Integer>[] buildSwitches()
 	{
 		int count = (int) switches.stream().filter(Objects::nonNull).count();