Simplify do_brk
- remove redundant asserts
- let VG_(am_extend_into_adjacent_reservation_client) worry about
  - whether delta is too large
  - whether the segment abutting this one exists and is a reservation
  The function already checks these things. No need to do it again here.
- do_brk does not need to know that a reservation segment must not
  shrink beyond a single page. That detail ought to be hidden in
  the address space manager.
Also, turn a few conditions into asserts.

git-svn-id: svn:// a5019735-40e9-0310-863c-91ae7b9d1cf9
1 file changed