Set canRetransform flag to false in instrumentation.

We do not need to retransform classes once they are loaded.
All instrumentation byte-code is pushed at loading time.

This fixes a problem with Java 7 that was failing to add
a transformer because we did not declare retransformation
capability in `MANIFEST.MF` file in Java agent jar.
Java 6 allowed to add transformer due to a bug.

src/partest/scala/tools/partest/javaagent/ProfilingAgent.java

@@ -20,6 +20,6 @@ public static void premain(String args, Instrumentation inst) throws Unmodifiabl
 	  // and the test-case itself won't be loaded yet. We rely here on the fact that ASMTransformer does
 	  // not depend on Scala library. In case our assumptions are wrong we can always insert call to
 	  // inst.retransformClasses.
-		inst.addTransformer(new ASMTransformer(), true);
+	  inst.addTransformer(new ASMTransformer(), false);
 	}
 }