Mark a few static inline helpers with ASSERTED

Quiet warnings in release builds where these look unused.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3866>

src/compiler/nir/nir_instr_set.c

@@ -39,7 +39,7 @@ dest_is_ssa(nir_dest *dest, void *data)
    return dest->is_ssa;
 }
 
-static inline bool
+ASSERTED static inline bool
 instr_each_src_and_dest_is_ssa(const nir_instr *instr)
 {
    if (!nir_foreach_dest((nir_instr *)instr, dest_is_ssa, NULL) ||

src/util/hash_table.c

@@ -101,7 +101,7 @@ static const struct {
    ENTRY(2147483648ul, 2362232233ul, 2362232231ul )
 };
 
-static inline bool
+ASSERTED static inline bool
 key_pointer_is_reserved(const struct hash_table *ht, const void *key)
 {
    return key == NULL || key == ht->deleted_key;

src/util/set.c

@@ -92,7 +92,7 @@ static const struct {
    ENTRY(2147483648ul, 2362232233ul, 2362232231ul )
 };
 
-static inline bool
+ASSERTED static inline bool
 key_pointer_is_reserved(const void *key)
 {
    return key == NULL || key == deleted_key;