Added type param to DVarValue as DMD sometimes overrides the type of the VarDeclaration.

Added support for align(1)/packed structs, other alignments are still ignored.
Fixed some problems with accessing lazy arguments.

ir/irstruct.cpp

@@ -48,6 +48,8 @@ IrStruct::IrStruct(Type* t)
     classDeclared = false;
     classDefined = false;
 
+    packed = false;
+
     dwarfComposite = NULL;
 }