allocator: add some function attributes

src/stack_allocator.c

 #include "stack_allocator.h"
 
+MALLOC_FUNCTION
 static struct chunk * alloc_chunk(size_t size) {
     struct chunk * c = (struct chunk*)xalloc(sizeof(struct chunk) + size);
     c->data = c->top = c + 1;

src/stack_allocator.h

 #include "global.h"
+#include "pike_memory.h"
 
 struct stack_allocator {
     struct chunk * cur;
@@ -31,6 +32,7 @@ static INLINE void sa_alloc_enlarge(struct stack_allocator * a, size_t size) {
         stack_alloc_enlarge(a, size);
 }
 
+MALLOC_FUNCTION
 static INLINE void * sa_alloc_fast(struct stack_allocator * a, size_t size) {
     struct chunk * c = a->cur;
     void * ret = c->top;
@@ -38,6 +40,7 @@ static INLINE void * sa_alloc_fast(struct stack_allocator * a, size_t size) {
     return ret;
 }
 
+MALLOC_FUNCTION
 static INLINE void * sa_alloc(struct stack_allocator * a, size_t size) {
     sa_alloc_enlarge(a, size);
     return sa_alloc_fast(a, size);