Fix elisp-tests-with-temp-buffer compilation

Fix elisp-tests-with-temp-buffer compilation

* test/lisp/emacs-lisp/lisp-tests.el (elisp-tests-with-temp-buffer):
Don't refer to the =!NAME= as "markers" since they produce variables
with just plain positions, not marker objects.  Explicitly specify
that CONTENTS is evaluated at compile time.  Don't re-evaluate
CONTENTS at runtime.  Fix debug specification.  Suppress warnings due
to BODY not using =!NAME= variables.
(elisp-test-point-position-regex): Rename from
`elisp-test-point-marker-regex'.
(mark-defun-test-buffer): Wrap in `eval-and-compile'.