* dwarf2dbg.c (dwarf2_where): Set line->isa.

    * dwarf2dbg.c (dwarf2_where): Set line->isa.
        (dwarf2_set_isa): New.
        (dwarf2_directive_loc): Rearrange to allow all options on one line.
        * dwarf2dbg.h (dwarf2_set_isa): Declare.
        * doc/as.texinfo: Update .loc documentation.

        * gas/lns/lns-common-1.d: Don't match header or special opcode numbers.
        * gas/lns/lns-common-1.s: Update for syntax change.
        * gas/lns/lns-diag-1.[sl]: Likewise.