Removed warnings on ignored aligns. Only do aligment on packed structs, align(1) struct Packed { ... }

Changed the way struct/class fields are added, first small part of cleaning up these...
Make struct/class/union fields aware of any anonymous struct/union they might be part of, not yet really useful, but part of getting better union support.

ir/irstruct.h

@@ -53,6 +53,8 @@ public:
     IrStruct(Type*);
     virtual ~IrStruct();
 
+    void addField(VarDeclaration* v);
+
     Type* type;
     llvm::PATypeHolder recty;
     OffsetMap offsets;