lib: Add __hot and __cold macros
A prep patch. These macros will be used to annotate hot and cold
functions. Currently, the __hot macro is not used, we will only use
the __cold macro at the moment.
Link:
#endif
#define __maybe_unused __attribute__((__unused__))
+#define __hot __attribute__((__hot__))
+#define __cold __attribute__((__cold__))
void *__uring_malloc(size_t len);
void __uring_free(void *p);
