[PATCH] Add support for ARM modified immediate syntax

[Tim Northover]

> There are two different issues that were brought up:
>
> 1. whether this support should be implemented in the first place

I don't think anyone's argued that the syntax shouldn't be supported.
It's definitely a good idea, and a necessity if we claim to be a full
ARM assembler.

> 2. the exact manner of implementation

That's where the disagreements are, I think.

Cheers.

Tim.