stage2: dwarf: fix standard opcode length of LNS_fixed_advance_pc
stage2: dwarf: fix standard opcode length of LNS_fixed_advance_pc

zig-lang/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,zig-lang/zig,raulgrell/zig,andrewrk/zig,raulgrell/zig