This reminded me of PyPy, where (I think) you write an interpreter, than add what they call JIT hints to the interpreter to help it do a good job of JITting the interpreted code.
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That's different though in that in the case of PyPy you are writing an interpreter and get a JIT that's generated and takes those hints into account.
The authors of programs that are being interpreted by that interpreter are unable to provide any information to the JIT.