Debug info - Implement more instructions:
Debug info - Implement more instructions:

- bin_op
- un_op
- block
- struct_field_ptr
- br
- condbr

Also updates constant to write the actual Type, rather than the enum tag of the `Ref`.

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