Hans Kristian Rosbach

MSVC had support for this before the stated version, but I found some references to bugs, so ended up setting VS 2012 as lower end. Clang had support from 4.5...

I'll have to redo this PR, as I had initially suspected, not all the asserts are in fact usable as assume hints (some variables do not exist in release builds,...

> > I need to consider whether to add all Assume hints separately, or whether to introduce another Assert() that does Assume in release builds, while the normal one does...