Don't call syscall on tvos

Author: Adlai-Holler

Source/Base/ASSignpost.h

@@ -72,7 +72,7 @@ NS_INLINE void ASSignpost(ASSignpostName name, uintptr_t identifier = 0, uintptr
   if (kASSignpostsEnabled) {
     if (AS_AVAILABLE_IOS_TVOS(10, 10)) {
       kdebug_signpost(name, identifier, arg2, 0, ASSignpostGetColor(name, preferred_color));
-    } else {
+    } else if (AS_AVAILABLE_IOS(9)) {
       syscall(SYS_kdebug_trace, APPSDBG_CODE(DBG_MACH_CHUD, name) | DBG_FUNC_NONE, identifier, arg2, 0, ASSignpostGetColor(name, preferred_color));
     }
   }
@@ -83,7 +83,7 @@ NS_INLINE void ASSignpostStart(ASSignpostName name, uintptr_t identifier = 0, ui
   if (kASSignpostsEnabled) {
     if (AS_AVAILABLE_IOS_TVOS(10, 10)) {
       kdebug_signpost_start(name, identifier, arg2, 0, 0);
-    } else {
+    } else if (AS_AVAILABLE_IOS(9)) {
       syscall(SYS_kdebug_trace, APPSDBG_CODE(DBG_MACH_CHUD, name) | DBG_FUNC_START, (uintptr_t)identifier, (uintptr_t)arg2, 0, 0);
     }
   }
@@ -94,7 +94,7 @@ NS_INLINE void ASSignpostEnd(ASSignpostName name, uintptr_t identifier = 0, uint
   if (kASSignpostsEnabled) {
     if (AS_AVAILABLE_IOS_TVOS(10, 10)) {
       kdebug_signpost_end(name, identifier, arg2, 0, 0);
-    } else {
+    } else if (AS_AVAILABLE_IOS(9)) {
       syscall(SYS_kdebug_trace, APPSDBG_CODE(DBG_MACH_CHUD, name) | DBG_FUNC_END, identifier, arg2, 0, ASSignpostGetColor(name, preferred_color));
     }
   }