[phobos] [D-Programming-Language/phobos] ef34af: fix Win64 exception handling

[GitHub]

  Branch: refs/heads/phobos-1.x
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: ef34afa42a080dddafc8ce471e272935e6c94eb7
      https://github.com/D-Programming-Language/phobos/commit/ef34afa42a080dddafc8ce471e272935e6c94eb7
  Author: Walter Bright <walter at walterbright.com>
  Date:   2012-09-15 (Sat, 15 Sep 2012)

  Changed paths:
    M internal/alloca.d
    M internal/deh2.d
    M internal/dmain2.d

  Log Message:
  -----------
  fix Win64 exception handling