[PATCH] enhance register parsing in .cfi_* handling (v2)

[Jan Beulich]

>The old assembler uses the same register syntax in .cfi_* directives
>as in normal instructions. The new one allows naked registers
>unconditionally.  I think .cfi_* directives should be consistent
>with instructions.

I definitely disagree, and you can check that Linux actually uses naked
registers as .cfi_* arguments, but uses normal AT&T syntax everywhere
else. The code could have been simpler if I didn't need to cover that
case.

Jan