Thumb-2 assembler fixes, 0/5

[Nick Clifton]

Hi Joseph,

> I'm sending a series of five patches by Mark Mitchell to fix bugs in the 
> Thumb-2 assembler and improve checks for invalid input.
> 
> Each patch is relative to a tree with the previous patch applied; each 
> such successive intermediate tree with patches 1-N applied has passed 
> validation.

Note - since Mark is a binutils ARM maintainer, and all of the these 
patches are ARM specific, he could just apply the patches himself.  (Or 
even ask you to apply them on his behalf).

Cheers
   Nick