[phobos] [D-Programming-Language/phobos] 30ce82: add some Win64 functionality

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: 30ce828e56b34501feab438be1dc96631f5a4439
      https://github.com/D-Programming-Language/phobos/commit/30ce828e56b34501feab438be1dc96631f5a4439
  Author: Walter Bright <walter at walterbright.com>
  Date:   2012-10-18 (Thu, 18 Oct 2012)

  Changed paths:
    M std/math.d

  Log Message:
  -----------
  add some Win64 functionality