Guard prof_active reset by opt_prof

Set `prof_active` to read-only when `opt_prof` is turned off.

include/jemalloc/internal/prof_inlines_a.h

@@ -71,8 +71,19 @@ prof_accum_cancel(tsdn_t *tsdn, prof_accum_t *prof_accum,
 #endif
 }
 
+JEMALLOC_ALWAYS_INLINE void
+prof_active_assert() {
+	cassert(config_prof);
+	/*
+	 * If opt_prof is off, then prof_active must always be off, regardless
+	 * of whether prof_active_mtx is in effect or not.
+	 */
+	assert(opt_prof || !prof_active);
+}
+
 JEMALLOC_ALWAYS_INLINE bool
 prof_active_get_unlocked(void) {
+	prof_active_assert();
 	/*
 	 * Even if opt_prof is true, sampling can be temporarily disabled by
 	 * setting prof_active to false.  No locking is used when reading