Update hw4 to a newer version.

Signed-off-by: jmug <u.g.a.mariano@gmail.com>

hw4/hw4programs/run48.oat

@@ -0,0 +1,13 @@
+global a = 1;
+
+int f() {
+  a = a + 1;
+  return a;
+}
+
+int program (int argc, string[] argv) {
+  var b = new int[f()];
+  b[0] = f();
+  b[1] = f();
+  return a + b[0] + b[1]; 
+}