enhance .loc directive for dwarf3 special features

[Hans-Peter Nilsson]

> Date: Wed, 7 Sep 2005 12:28:22 -0700
> From: Richard Henderson <rth@redhat.com>

> Like so.  Tested on i686, cris, ...

Thanks for fixing it so swiftly!

I see I already *had* "#...":ed all dwarf headers ("Dump of
debug contents of section \.debug_line:") except (and intended)
in the trivial gas/cris/rd-dw2-1.

I think there *should* be one test checking that the headers are
in some shape *somewhere*, but I don't see one.  I'll add it
back in gas/cris/rd-dw2-1 unless I hear something better or the
sky falls down on me before I get to it.

brgds, H-P