[phobos] [D-Programming-Language/phobos] 8dec13: fix 2 reg case

[GitHub]

  Branch: refs/heads/phobos-1.x
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: 8dec134ca3771ab7c05a8a05b744894bd813b490
      https://github.com/D-Programming-Language/phobos/commit/8dec134ca3771ab7c05a8a05b744894bd813b490
  Author: Walter Bright <walter at walterbright.com>
  Date:   2012-06-18 (Mon, 18 Jun 2012)

  Changed paths:
    M std/c/stdarg.d

  Log Message:
  -----------
  fix 2 reg case