alloc-util: Disallow inlining of expand_to_usable

Explicitly set __attribute__ ((noinline)) so that the compiler does not
attempt to inline expand_to_usable, even with LTO.

(cherry picked from commit 4f79f545b3)
(cherry picked from commit e998c9d7c1)
(cherry picked from commit 4014688458)

src/basic/alloc-util.h

@@ -171,10 +171,11 @@ void* greedy_realloc0(void **p, size_t need, size_t size);
 #endif
 
 /* Dummy allocator to tell the compiler that the new size of p is newsize. The implementation returns the
- * pointer as is; the only reason for its existence is as a conduit for the _alloc_ attribute. This cannot be
+ * pointer as is; the only reason for its existence is as a conduit for the _alloc_ attribute.  This must not
- * a static inline because gcc then loses the attributes on the function.
+ * be inlined (hence a non-static function with _noinline_ because LTO otherwise tries to inline it) because
+ * gcc then loses the attributes on the function.
  * See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96503 */
-void *expand_to_usable(void *p, size_t newsize) _alloc_(2) _returns_nonnull_;
+void *expand_to_usable(void *p, size_t newsize) _alloc_(2) _returns_nonnull_ _noinline_;
 
 static inline size_t malloc_sizeof_safe(void **xp) {
         if (_unlikely_(!xp || !*xp))

src/fundamental/macro-fundamental.h

@@ -10,6 +10,7 @@
 
 #define _align_(x) __attribute__((__aligned__(x)))
 #define _const_ __attribute__((__const__))
+#define _noinline_ __attribute__((noinline))
 #define _pure_ __attribute__((__pure__))
 #define _section_(x) __attribute__((__section__(x)))
 #define _packed_ __attribute__((__packed__))