Your link there is to a link shortener, I think you mean TCC. :)
It really depends on what you're actually asking for. Do you want, for example, a "slimmer" Rust compiler that jettisons all the stuff that supports older language editions? Do you want a "simpler" compiler that only uses straightforward algorithms at the expense of compiler speed? Or do you want a faster compiler that does less optimization at the expense of code generation quality? The latter, at least, is something that the Cranelift backend for rustc hopes to achieve.
It really depends on what you're actually asking for. Do you want, for example, a "slimmer" Rust compiler that jettisons all the stuff that supports older language editions? Do you want a "simpler" compiler that only uses straightforward algorithms at the expense of compiler speed? Or do you want a faster compiler that does less optimization at the expense of code generation quality? The latter, at least, is something that the Cranelift backend for rustc hopes to achieve.