[Clang][Builtin] add __builtin_exit

Author: W-50243

clang/include/clang/Basic/Builtins.def

@@ -948,6 +948,7 @@ BUILTIN(__sync_fetch_and_umin, "UiUiD*Ui", "n")
 BUILTIN(__sync_fetch_and_umax, "UiUiD*Ui", "n")
 
 // Random libc builtins.
+BUILTIN(__builtin_exit, "vi", "Fnr")
 BUILTIN(__builtin_abort, "v", "Fnr")
 BUILTIN(__builtin_index, "c*cC*i", "Fn")
 BUILTIN(__builtin_rindex, "c*cC*i", "Fn")