[svn r12] fixed accessing aggregate fields of aggregates

removed some useless branches for successive scopes ala {}{}{}

test/scope1.d

@@ -0,0 +1,10 @@
+module scope1;
+
+void main()
+{
+    printf("1\n");
+    {
+        scope(exit) printf("2\n");
+    }
+    printf("3\n");
+}