[svn r10] Updated for LLVM rev. 20070913

Applied fixes from wilsonk on the forum
Some tweaks to work with gc 7.0
Fixed aggregate members of aggregates
Fixed cyclic/recursive class declarations
Other minor tweaks

test/classes5.d

@@ -0,0 +1,17 @@
+module classes5;
+
+struct S
+{
+    long l;
+}
+
+class C
+{
+    C c;
+    S s;
+}
+
+void main()
+{
+    //C c = new C;
+}