stack: grow on page fault

The steps of the technique to replace stack with hugetlbfs map are as
follows:

(1) Prepare a hugetlbfs map with the size of rlim_cur
(2) Copy the active region of the stack to the hugetlbfs map.
    The range to copy is determined by reading /proc/[pid]/maps.
(3) Replace the stack map with the hugetlbfs map

The step (2) tries to copy a huge region if McKernel doesn't grow the
stack at run-time.

Change-Id: I5858c35b5c26dd0a42cccf9e3cc4c64b1a81f160

kernel/hugefileobj.c

@@ -139,7 +139,6 @@ static void hugefileobj_free(struct memobj *memobj)
 struct memobj_ops hugefileobj_ops = {
 	.free = hugefileobj_free,
 	.get_page = hugefileobj_get_page,
-
 };
 
 void hugefileobj_cleanup(void)