[phobos] [D-Programming-Language/phobos] a96255: Merge pull request #3712 from 9il/patch-4

[GitHub via phobos]

  Branch: refs/heads/stable
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: a96255a2501bc24bd09af9a9143e63d64f58e969
      https://github.com/D-Programming-Language/phobos/commit/a96255a2501bc24bd09af9a9143e63d64f58e969
  Author: Brian Schott <briancschott at gmail.com>
  Date:   2015-10-16 (Fri, 16 Oct 2015)

  Changed paths:
    M std/experimental/allocator/building_blocks/free_list.d

  Log Message:
  -----------
  Merge pull request #3712 from 9il/patch-4

[DMD 2.069][allocators] Fix issue 15188