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.

From-SVN: r102298