Fix beginning-of-defun not jumping to BOF

Fix beginning-of-defun not jumping to BOF

In batch mode or when font-lock and some other niceties are switched
off, function `syntax-ppss' can modify match data held by function
`beginning-of-defun-raw'.  In that case, `beginning-of-defun' can jump
to some seemingly arbitrary position, and not the actual BOF.

* lisp/emacs-lisp/lisp.el (beginning-of-defun-raw): Save match data
around a call to `syntax-ppss'. (Bug#66218)