Add caching for DontDirtyAttribute checking.
Add caching for DontDirtyAttribute checking.

Reflection is way too slow to check is like that every time after all.
Implemented a simple cache mechanism to do it only once for a property.

eatskolnikov/mobile,peeedge/mobile,masterrr/mobile,masterrr/mobile,ZhangLeiCharles/mobile,eatskolnikov/mobile,ZhangLeiCharles/mobile,peeedge/mobile,eatskolnikov/mobile