[ARM] fix missing expression bug

[Richard Earnshaw]

On Tue, 2009-08-04 at 14:53 +0100, Nathan Sidwell wrote:
> This patch fixes a bug in the arm assembler.  We were failing to detect a 
> missing expression, leading to object files with 'strange' relocations.  In the 
> particular testcase, '@r3' had been used as the operand, but @ is arm's comment 
> character, thus obscuring the syntax error.
> 
> Fixed thusly, tested on arm-eabi, ok?
> 
> nathan

OK
R.