FFI on AMD64

[Bruno H. <br...@cl...>]

Hello J=F6rg,

On Linux/x86_64, with a DEBUG_GCSAFETY build, the testsuite crashes twice:

(WITH-FOREIGN-OBJECT (X 'CHARACTER #\t) (C-SELF X))
[SIMPLE-ERROR]: #<FOREIGN-VARIABLE "EXEC-ON-STACK" #x0000007FBFFF08A0> cann=
ot be converted to the foreign type SHORT
*** - handle_fault error2 ! address =3D 0x9124e1f3f not in [0x99a364000,0x9=
9a641690) !
SIGSEGV cannot be cured. Fault address =3D 0x9124e1f3f.

(BLOCK ABORT (WITH-FOREIGN-OBJECT (FV 'SINT16 -563) (SETQ FM FV) (RETURN-FR=
OM ABORT 246)))
*** - handle_fault error2 ! address =3D 0x91251d601 not in [0x99a364000,0x9=
9a641690) !
SIGSEGV cannot be cured. Fault address =3D 0x91251d601.

The rest of the testsuite passes OK. And the ffcall testsuite passed, of
course.

Bruno