[PATCH] Add support for ARM modified immediate syntax

[Tim Northover]

> regarding disassembly - I can add that in, it's rather simple.

Could I ask what your plans are there? Simply allowing these "rii"
instructions to take part in disassembly would be problematic, since
we don't want *every* immediate to print as "#a, #b". That's almost as
bad as distinct instructions printing identically.

Don't worry about explaining everything if the patch is going to come
along shortly though, I'm quite happy to wait and see.

> Having that, may I commit as first step in the incremental solution?

Yes.

Cheers.

Tim.