[VTA merge] Some dwarf problems

[Hariharan]

Hi Alexandre,
I was having some trouble with dwarf sections in picochip port. I am not 
a dwarf expert, but when i looked at the changes in r151312, file 
dwarf2out.c, function dwarf2out_var_location on line 17965, we have

         sprintf (loclabel, "%s-1", last_label);
         ...

What is last_label-1 supposed to point to?

Thanks for your help.

Hari