Remove use of deprecated ClassReader.b field

src/main/java/org/apache/harmony/pack200/NewAttribute.java

@@ -104,7 +104,7 @@ public class NewAttribute extends Attribute {
     protected Attribute read(ClassReader cr, int off, int len, char[] buf,
             int codeOff, Label[] labels) {
         byte[] attributeContents = new byte[len];
-        System.arraycopy(cr.b, off, attributeContents, 0, len);
+        System.arraycopy(((Pack200ClassReader) cr).b, off, attributeContents, 0, len);
         return new NewAttribute(cr, type, layout, attributeContents, buf, codeOff,
                 labels);
     }

src/main/java/org/apache/harmony/pack200/Pack200ClassReader.java

@@ -24,6 +24,7 @@ import org.objectweb.asm.ClassReader;
  */
 public class Pack200ClassReader extends ClassReader {
 
+    final byte[] b;
     private boolean lastConstantHadWideIndex;
     private int lastUnsignedShort;
     private boolean anySyntheticAttributes;
@@ -35,13 +36,14 @@ public class Pack200ClassReader extends ClassReader {
      */
     public Pack200ClassReader(byte[] b) {
         super(b);
+        this.b = b;
     }
 
     public int readUnsignedShort(int index) {
         // Doing this to check whether last load-constant instruction was ldc (18) or ldc_w (19)
         // TODO:  Assess whether this impacts on performance
         int unsignedShort = super.readUnsignedShort(index);
-        if(index > 0 && b[index - 1] == 19) {
+        if(index > 0 && readByte(index - 1) == 19) {
             lastUnsignedShort = unsignedShort;
         } else {
             lastUnsignedShort = Short.MIN_VALUE;