Fix minor compile warnings

generators/builtins/progressions.kt

@@ -47,7 +47,6 @@ class GenerateProgressions(out: PrintWriter) : BuiltInsSourceGenerator(out) {
                 "        if (isEmpty()) -1 else (31 * (31 * first + last) + step)"
             LONG ->
                 "        if (isEmpty()) -1 else (31 * (31 * ${hashLong("first")} + ${hashLong("last")}) + ${hashLong("step")}).toInt()"
-            else -> throw IllegalArgumentException()
         }
 
         out.println(

generators/builtins/unsignedTypes.kt

@@ -371,7 +371,6 @@ class UnsignedTypeGenerator(val type: UnsignedType, out: PrintWriter) : BuiltIns
             UnsignedType.UBYTE, UnsignedType.USHORT -> out.println("toInt().toString()")
             UnsignedType.UINT -> out.println("toLong().toString()")
             UnsignedType.ULONG -> out.println("ulongToString(data)")
-            else -> error(type)
         }
 
         out.println()