[asm-cherry-pick] asm.CustomAttribute class

Allows creating an asm.Attribute and directly providing the content
as a byte array.

Originally added in
lrytz/scala@9a7e518

Author: lrytz

src/main/java/scala/tools/asm/Attribute.java

@@ -48,7 +48,7 @@ public class Attribute {
    * The 6 header bytes of the attribute (attribute_name_index and attribute_length) are <i>not</i>
    * included.
    */
-  private byte[] content;
+  protected byte[] content;
 
   /**
    * The next attribute in this attribute list (Attribute instances can be linked via this field to

src/main/java/scala/tools/asm/CustomAttr.java

@@ -0,0 +1,20 @@
+/* NSC -- new Scala compiler
+ * Copyright 2005-2012 LAMP/EPFL
+ */
+
+package scala.tools.asm;
+
+import scala.tools.asm.Attribute;
+
+/**
+ * A subclass of ASM's Attribute for the sole purpose of accessing a protected field there.
+ *
+ */
+public class CustomAttr extends Attribute {
+
+    public CustomAttr(final String type, final byte[] value) {
+        super(type);
+        super.content = value;
+    }
+
+}