Trampoline doesn't need a return area
TRAMPOLINE-STACK-SET-SIZE! -> TRAMPOLINE-STACK-SIZE-SET!
TRAMPOLINE-IMP* -> TRAMPOLINE-TARGET*
TRAMPOLINE-TARGET-REF -> TRAMPOLINE-TARGET
Move REDUCE-CLASSIFICATION/INTERNAL to end of file
Rename objc-x86_64 -> x86_64-type
Introduce PARSE-FUNCTION-SIGNATURE