Extract P6Opaque.ByteClassLoader to its own class.

This is in preparation for CStruct support on JVM, which needs some of the
same class generation infrastructure as P6Opaque.

Author: arnsholt

src/vm/jvm/runtime/org/perl6/nqp/sixmodel/ByteClassLoader.java

@@ -0,0 +1,13 @@
+package org.perl6.nqp.sixmodel;
+
+public class ByteClassLoader extends ClassLoader {
+    private byte[] bytes;
+
+    public ByteClassLoader(byte[] bytes) {
+        this.bytes = bytes;
+    }
+
+    public Class<?> findClass(String name) {
+        return defineClass(name, this.bytes, 0, this.bytes.length);
+    }
+}

src/vm/jvm/runtime/org/perl6/nqp/sixmodel/reprs/P6Opaque.java

@@ -14,6 +14,7 @@
 import org.objectweb.asm.Type;
 import org.perl6.nqp.runtime.ExceptionHandling;
 import org.perl6.nqp.runtime.ThreadContext;
+import org.perl6.nqp.sixmodel.ByteClassLoader;
 import org.perl6.nqp.sixmodel.REPR;
 import org.perl6.nqp.sixmodel.STable;
 import org.perl6.nqp.sixmodel.SerializationReader;
@@ -719,18 +720,6 @@ public long hint_for(ThreadContext tc, STable st, SixModelObject classHandle, St
         return STable.NO_HINT;
     }
 
-    private class ByteClassLoader extends ClassLoader {
-        private byte[] bytes;
-        
-        public ByteClassLoader(byte[] bytes) {
-            this.bytes = bytes;
-        }
-        
-        public Class<?> findClass(String name) {
-            return defineClass(name, this.bytes, 0, this.bytes.length);
-        }
-    }
-    
     @SuppressWarnings("unchecked")
     public void deserialize_repr_data(ThreadContext tc, STable st, SerializationReader reader) {
         // Instantiate REPR data.