[Patch] Introduce DWARF2_VERSION

[Nick Clifton]

Hi Tristan,

> gas/
> 2011-03-28  Tristan Gingold<gingold@adacore.com>
>
> 	* dwarf2dbg.c (DWARF2_VERSION): Define.
> 	(out_debug_line): Use it.
> 	(out_debug_aranges): Ditto.
> 	(out_debug_info): Ditto.
> 	* config/tc-ia64.h (DWARF2_VERSION): Override it.

Approved - please apply.

Cheers
   Nick