Anyone who knows 0.1% about LLMs should know that they are not deterministic systems and are totally unpredictable with their outputs meaning that they cannot become compilers at all.
The obvious has been stated.
Anyone who knows 0.2% about LLMs should know that they can be sampled deterministically, and yet that doesn't change the argument.
Anyone that knows 0.1% about GC and JIT compilers also knows how hard is to have deterministic behaviours, and how much their behaviours are driven by heuristics.