pass arguments to unknown function calls in registers
We now have more stg_ap entry points: stg_ap_*_fast, which take arguments in registers according to the platform calling convention. This is faster if the function being called is evaluated and has the right arity, which is the common case (see the eval/apply paper for measurements). We still need the stg_ap_*_info entry points for stack-based application, such as an overflows when a function is applied to too many argumnets. The stg_ap_*_fast functions actually just check for an evaluated function, and if they don't find one, push the args on the stack and invoke stg_ap_*_info. (this might be slightly slower in some cases, but not the common case).
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