Option to run llvm-lines on particular example or test in the crate

[bluss]

(Feature request) An option that would be equivalent to --example X or --test Y, and show the instantiations for that target.

[graydon]

Yes please! Currently doing somewhat contorted test-embedded-in-a-binary-of-a-subcrate business to accomplish this.

(Also this tool is extremely fantastic and sorely needed by the ecosystem, bravo for building it! You may not believe this but "count the IR" is a thing I put in the compiler in an extremely primitive form a million years ago -- outputting du-compatible output so you could browse with xdu! -- and even in that form it was one of the most effective tools in the kit for figuring out crude "where to trim" in a rust program.)

[bluss]

--example is done in #42 🙂