[Improvement] Consider changing parameters positions on rebind function

[crisadamo]

It will be nice to change the current rebind parameters from [dest, src] to [src, dest] since its more intuitive that the other way around.

The current signature is rebind[dest_type, src_type](src_val)

[lattner]

The current way works better with parameter inference though, because you can call it with rebind[dest_type](src_val) and have src_type inferred from the argument.

[czheo]

Wondering if it is a coincidence that assembly like mov dest, src also has the same order...