Merged DMD 2.021 frontend.

Removed generated files from dmd/dmd2 dirs.

dmd2/struct.c

@@ -264,7 +264,11 @@ void StructDeclaration::semantic(Scope *sc)
     }
 
     parent = sc->parent;
+#if STRUCTTHISREF
+    handle = type;
+#else
     handle = type->pointerTo();
+#endif
     structalign = sc->structalign;
     protection = sc->protection;
     storage_class |= sc->stc;