Move sanity checking to start of main loop

... just after clearing the object bypasses, as some
of the monster movement code may use object bypass flags.

src/allmain.c

@@ -156,6 +156,9 @@ moveloop_core(void)
     if (g.context.bypasses)
         clear_bypasses();
 
+    if (iflags.sanity_check || iflags.debug_fuzzer)
+        sanity_check();
+
     if (g.context.move) {
         /* actual time passed */
         g.youmonst.movement -= NORMAL_SPEED;
@@ -447,9 +450,6 @@ moveloop_core(void)
         return;
     }
 
-    if (iflags.sanity_check || iflags.debug_fuzzer)
-        sanity_check();
-
 #ifdef CLIPPING
     /* just before rhack */
     cliparound(u.ux, u.uy);