patch for Regressions from "[rfc] -gdwarf-3 and DW_OP_call_frame_cfa"

[Hans-Peter Nilsson]

> Date: Fri, 12 Jun 2009 06:23:37 -0700
> From: "H.J. Lu" <hjl.tools@gmail.com>

> See:
> 
> http://gcc.gnu.org/ml/gcc-regression/2009-06/msg00080.html
> 
> Revision 148408 is the cause.

Which is exactly the commit of RTH's patch to which I replied.
To be clearer (I hope) to other quick readers, the doubt I have
is regarding *further* regressions, exposed once the testsuite
is fixed to emit e.g. -gdwarf-2 -g1 instead of -gdwarf-21.

brgds, H-P