Fix bytecode test

Author: odersky

compiler/test/dotty/tools/backend/jvm/DottyBytecodeTests.scala

@@ -424,9 +424,6 @@ class TestBCode extends DottyBytecodeTest {
         VarOp(Opcodes.ALOAD, 2),
         TypeOp(Opcodes.INSTANCEOF, "Test"),
         Jump(Opcodes.IFEQ, Label(11)),
-        VarOp(Opcodes.ALOAD, 2),
-        TypeOp(Opcodes.CHECKCAST, "Test"),
-        VarOp(Opcodes.ASTORE, 3),
         Field(Opcodes.GETSTATIC, "scala/Predef$", "MODULE$", "Lscala/Predef$;"),
         Invoke(Opcodes.INVOKEVIRTUAL, "scala/Predef$", "$qmark$qmark$qmark", "()Lscala/runtime/Nothing$;", false),
         Op(Opcodes.ATHROW),