Interface BuiltInFnInfo

Semantics of a built-in that hold no matter which processor handles the call. The remaining facts already have a home: the exit behavior in cfg, whether flowR can fold the call in the evalHandler of the definition, and the fallback for everything unmodelled in hasUnknownSideEffects.

interface BuiltInFnInfo {
props?: number;
sig?: FnSig;
}