Inline maybe_quit

Since `maybe_quit` is called on many critical paths, inline a slightly
cheaper condition (that ignores Vinhibit_quit).

* src/eval.c (maybe_quit): Rename to `probably_quit`.
* src/lisp.h (maybe_quit): New simplified inline function.

src/ccl.c

@@ -33,6 +33,7 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 #include "charset.h"
 #include "ccl.h"
 #include "coding.h"
+#include "keyboard.h"
 
 /* Table of registered CCL programs.  Each element is a vector of
    NAME, CCL_PROG, RESOLVEDP, and UPDATEDP, where NAME (symbol) is the

src/eval.c

@@ -1737,21 +1737,8 @@ process_quit_flag (void)
   quit ();
 }
 
-/* Check quit-flag and quit if it is non-nil.  Typing C-g does not
-   directly cause a quit; it only sets Vquit_flag.  So the program
-   needs to call maybe_quit at times when it is safe to quit.  Every
-   loop that might run for a long time or might not exit ought to call
-   maybe_quit at least once, at a safe place.  Unless that is
-   impossible, of course.  But it is very desirable to avoid creating
-   loops where maybe_quit is impossible.
-
-   If quit-flag is set to `kill-emacs' the SIGINT handler has received
-   a request to exit Emacs when it is safe to do.
-
-   When not quitting, process any pending signals.  */
-
 void
-maybe_quit (void)
+probably_quit (void)
 {
   if (!NILP (Vquit_flag) && NILP (Vinhibit_quit))
     process_quit_flag ();

src/lisp.h

@@ -3422,12 +3422,34 @@ struct handler
 
 extern Lisp_Object memory_signal_data;
 
-extern void maybe_quit (void);
-
 /* True if ought to quit now.  */
 
 #define QUITP (!NILP (Vquit_flag) && NILP (Vinhibit_quit))
 
+extern bool volatile pending_signals;
+extern void process_pending_signals (void);
+extern void probably_quit (void);
+
+/* Check quit-flag and quit if it is non-nil.  Typing C-g does not
+   directly cause a quit; it only sets Vquit_flag.  So the program
+   needs to call maybe_quit at times when it is safe to quit.  Every
+   loop that might run for a long time or might not exit ought to call
+   maybe_quit at least once, at a safe place.  Unless that is
+   impossible, of course.  But it is very desirable to avoid creating
+   loops where maybe_quit is impossible.
+
+   If quit-flag is set to `kill-emacs' the SIGINT handler has received
+   a request to exit Emacs when it is safe to do.
+
+   When not quitting, process any pending signals.  */
+
+INLINE void
+maybe_quit (void)
+{
+  if (!NILP (Vquit_flag) || pending_signals)
+    probably_quit ();
+}
+
 /* Process a quit rarely, based on a counter COUNT, for efficiency.
    "Rarely" means once per USHRT_MAX + 1 times; this is somewhat
    arbitrary, but efficient.  */