Fix AMD64 bootstrap failure

TODO.FACTOR.txt

@@ -1,7 +1,7 @@
 + portability:
 
 - port ffi to win64
-- update x86 for %unbox-struct and callbacks
+- update x86 for callbacks
 - update amd64 for %unbox-struct and callbacks
 - get factor running on mac intel
 

library/compiler/amd64/alien.factor

@@ -34,7 +34,7 @@ M: %unbox generate-node ( vop -- )
     ! Store the return value on the C stack
     0 input 1 input store-insn ;
 
-M: %parameter generate-node ( vop -- )
+M: %stack>freg generate-node ( vop -- )
     ! Move a value from the C stack into the fastcall register
     drop 0 input 1 input 2 input load-insn ;