Don't attempt to recover from undefined behavior in some cases

Don't attempt to recover from undefined behavior in some cases

These functions can only be run in batch mode and exit Emacs on
return, so nothing can be recovered.  Disable unsafe recover
mechanisms so that we get real failures and good stack traces on
fatal signals.

* lisp/emacs-lisp/bytecomp.el (batch-byte-compile)
(batch-byte-recompile-directory):
* lisp/emacs-lisp/ert.el (ert-run-tests-batch-and-exit)
(ert-summarize-tests-batch-and-exit): Don't attempt to recover
from undefined behavior.