[feat] add mechanism to show coverage in object code

[wucke13]

Many constructs in Rust can create a multitude of differing object code. To address this, it would be advantageous to measure the coverage at the object code level. This way, for example multiple instantiations of a single function generic function are verifiably covered.

Is it possible to add this to llvm-profparser?

[xd009642]

Yes, it is in the LLVM information some stuff about instantiation. I can't remember if I just collapse it during report generating or some later point but I definitely do a merging process at some point that collapses down the instances. I'll have to dig into the code a bit more to find it as I can't find exactly where it is from a quick glance (and searching for what I would expect myself to put in a useful comment yielded no hits)