Add non debug version of libarttest

We now pass the libarttest as an argument to the java program. This
enables using libarttestd by default and libarttest when -O is
specified.

Change-Id: I0de1ae01e2bb5f7b9c7fd7487b6cb55051f60657
diff --git a/test/StackWalk2/StackWalk2.java b/test/StackWalk2/StackWalk2.java
index a879b46..5e7b22c 100644
--- a/test/StackWalk2/StackWalk2.java
+++ b/test/StackWalk2/StackWalk2.java
@@ -50,11 +50,8 @@
 
   native int refmap2(int x);
 
-  static {
-    System.loadLibrary("arttest");
-  }
-
   public static void main(String[] args) {
+    System.loadLibrary(args[0]);
     StackWalk2 st = new StackWalk2();
     st.f();
   }