Fix inheritance issue in ClassCastException causing InvokePolymorphicExpr

NewTransformer#findInvokeExpr attempts to cast InvokePolymorphicExpr to InvokeExpr under certain inputs, which causes a ClassCastException. It appears that InvokePolymorphicExpr was meant to extend InvokeExpr for this reason.

Author: nick-botticelli

dex-ir/src/main/java/com/googlecode/dex2jar/ir/expr/InvokePolymorphicExpr.java

@@ -5,12 +5,10 @@
 import com.googlecode.dex2jar.ir.LabelAndLocalMapper;
 import com.googlecode.dex2jar.ir.Util;
 
-public class InvokePolymorphicExpr extends AbstractInvokeExpr {
+public class InvokePolymorphicExpr extends InvokeExpr {
 
     public Proto proto;
 
-    public Method method;
-
     @Override
     protected void releaseMemory() {
         method = null;
@@ -24,9 +22,8 @@ public Proto getProto() {
     }
 
     public InvokePolymorphicExpr(VT type, Value[] args, Proto proto, Method method) {
-        super(type, args);
+        super(type, args, method);
         this.proto = proto;
-        this.method = method;
     }
 
     @Override