Revert changes of system_reserved_names.gen.py

Author: frederick-vs-ja

libcxx/test/libcxx/system_reserved_names.gen.py

@@ -154,10 +154,6 @@
 #define Xp SYSTEM_RESERVED_NAME
 #define Xs SYSTEM_RESERVED_NAME
 
-// These attribute-tokens are not reserved, so the user can macro-define them.
-#define lifetimebound SYSTEM_RESERVED_NAME
-#define noescape SYSTEM_RESERVED_NAME
-
 // The classic Windows min/max macros
 #define min SYSTEM_RESERVED_NAME
 #define max SYSTEM_RESERVED_NAME