Patch to make dwarf2 tests pass when dwarf-2 is not default

[Jeff Law]

On 07/08/2015 08:53 AM, Carlos Sánchez de La Lama wrote:
> 2015-07-08  Carlos Sánchez de La Lama<csanchezdll@gmail.com>
>
> 	* g++.dg/debug/dwarf2/*.C: generate dwarf-2 debug information
> 	even when dwarf-2 is not the default.
Thanks.  Installed on the trunk after verifying they didn't change the 
results of an x86_64-unknown-linux-gnu testrun.

Jeff