std.debug: fix some issues with freestanding debug info
std.debug: fix some issues with freestanding debug info

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