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The IRHeader itself contains a flag for if a block should fallback to the interpreter. This is necessary for the case that an IR is loaded and the Frontend object no longer has the data necessary to know if it should do an interpreter fallback. This is super useful for bisecting JIT versus Intepreter failures, and also cases where falling back to intepreter for compatibility is a lot more simple than wiring things through the JIT (ala x87) This isn't currently utilized, but will be once x87 work lands