Fix Joe Groff's x86-64 structs/callbacks bug

basis/cpu/x86/32/32.factor

@@ -173,6 +173,9 @@ M: x86.32 %box-long-long ( n func -- )
         [ (%box-long-long) ] [ f %alien-invoke ] bi*
     ] with-aligned-stack ;
 
+: struct-return@ ( size n -- n )
+    [ stack-frame* cell + + ] [ \ stack-frame get swap - ] ?if ;
+
 M: x86.32 %box-large-struct ( n size -- )
     ! Compute destination address
     [ swap struct-return@ ] keep

basis/cpu/x86/64/64.factor

@@ -116,6 +116,9 @@ M: x86.64 %box-small-struct ( size -- )
     RDX swap MOV
     "box_small_struct" f %alien-invoke ;
 
+: struct-return@ ( size n -- n )
+    [ ] [ \ stack-frame get swap - ] ?if ;
+
 M: x86.64 %box-large-struct ( n size -- )
     ! Struct size is parameter 2
     RSI over MOV

basis/cpu/x86/architecture/architecture.factor

@@ -141,13 +141,6 @@ M: x86 small-enough? ( n -- ? )
 
 : temp@ ( n -- op ) stack-reg \ stack-frame get rot - [+] ;
 
-: struct-return@ ( size n -- n )
-    [
-        stack-frame* cell + +
-    ] [
-        \ stack-frame get swap -
-    ] ?if ;
-
 HOOK: %unbox-struct-1 cpu ( -- )
 
 HOOK: %unbox-struct-2 cpu ( -- )