sysv.S (ffi_call_SYSV): Stop argument popping correctly on sh3.
* src/sh/sysv.S (ffi_call_SYSV): Stop argument popping correctly
on sh3.
(ffi_closure_SYSV): Change the stack layout for sh3 struct argument.
* src/sh/ffi.c (ffi_prep_args): Fix sh3 argument copy, when it is
partially on register.
(ffi_closure_helper_SYSV): Likewise.
(ffi_prep_cif_machdep): Don't set too many cif->flags.