Kernel: Start working on TLS, add SYS_{SET,GET}_TLS

userspace/libraries/LibC/include/sys/syscall.h

@@ -91,6 +91,8 @@ __BEGIN_DECLS
 	O(SYS_SYMLINKAT,		symlinkat)		\
 	O(SYS_HARDLINKAT,		hardlinkat)		\
 	O(SYS_YIELD,			yield)			\
+	O(SYS_SET_TLS,			set_tls)		\
+	O(SYS_GET_TLS,			get_tls)		\
 	O(SYS_PTHREAD_CREATE,	pthread_create)	\
 	O(SYS_PTHREAD_EXIT,		pthread_exit)	\
 	O(SYS_PTHREAD_JOIN,		pthread_join)	\