Tune SAFE_FREE

On my platform (Fedora 28 x86-64, AMD Phenom II X4 910e) this sped
up a SAFE_FREE-using microbenchmark (string-distance "abc" "abc")
by about 18%, and shrank the Emacs text size by about 0.1%.
* src/callint.c (Fcall_interactively):
* src/callproc.c (call_process):
* src/doc.c (get_doc_string, Fsnarf_documentation):
* src/editfns.c (Freplace_buffer_contents):
* src/emacs-module.c (funcall_module):
* src/eval.c (Flet):
* src/process.c (Fmake_process):
* src/term.c (tty_menu_show):
* src/xdisp.c (safe__call):
* src/xmenu.c (x_menu_show):
Use SAFE_FREE_UNBIND_TO.
* src/data.c (wrong_choice): No need to call SAFE_FREE here.
* src/lisp.h (USE_SAFE_ALLOCA):
* src/regex.c (REGEX_USE_SAFE_ALLOCA):
Do not declare sa_must_free local; no longer needed.
All uses removed.
(SAFE_FREE): Rewrite in terms of safe_free.
(safe_free): New function, optimized to use xfree.
(SAFE_FREE_UNBIND_TO): New macro.
(safe_free_unbind_to): New function.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/emacs-module.c b/src/emacs-module.c
index 3a246637990..5b9f6629e76 100644
--- a/src/emacs-module.c
+++ b/src/emacs-module.c
@@ -786,7 +786,6 @@ funcall_module (Lisp_Object function, ptrdiff_t nargs, Lisp_Object *arglist)
     }
 
   emacs_value ret = func->subr (env, nargs, args, func->data);
-  SAFE_FREE ();
 
   eassert (&priv == env->private_members);
 
@@ -795,7 +794,7 @@ funcall_module (Lisp_Object function, ptrdiff_t nargs, Lisp_Object *arglist)
   maybe_quit ();
 
   module_signal_or_throw (&priv);
-  return unbind_to (count, value_to_lisp (ret));
+  return SAFE_FREE_UNBIND_TO (count, value_to_lisp (ret));
 }
 
 Lisp_Object