Fix an ARM unwinding table corner case

[Nick Clifton]

Hi Daniel,

> 2005-11-11  Daniel Jacobowitz  <dan@codesourcery.com>
> 
> 	* config/tc-arm.c (s_arm_unwind_save_core): Don't emit an extra
> 	opcode if r4-r15 are not saved.
> 
> 2005-11-11  Daniel Jacobowitz  <dan@codesourcery.com>
> 
> 	* gas/arm/unwind.s, gas/arm/unwind.d, gas/arm/unwind_vxworks.d: Add
> 	a test for saving only the low registers.

Approved - please apply.

Cheers
   Nick