Regarding all the questions about Julia:
There's ongoing work to reduce runtime dependencies of Julia (for example in 1.8, you can strip out the compiler and metadata), but then it's only approaching Go/Swift and other static languages with runtimes.
Generating standalone runtime free LLVM is another path, that is actually already pretty mature as it's what is being done for the GPU stack.
Someone just has to retarget that to cpu LLVM, and there's a start here: https://github.com/tshort/StaticCompiler.jl/issues/43
That's quite cool. Maybe the whole thing can be rewritten in Julia too at some point. I just know too little about Julia to judge.
You could also do it at the LLVM level: https://github.com/JuliaComputingOSS/llvm-cbe
One cool use case is in https://github.com/JuliaLinearAlgebra/Octavian.jl which relies on loopvectorization.jl to do transforms on Julia AST beyond what LLVM does. Because of that, Octavian.jl. a pure julia linalg library, beats openblas on many benchmarks