[phobos] [D-Programming-Language/phobos] 8153f0: use intrinsic ldexp

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: 8153f095b7cd4970e2a6464797fd4056a40705e9
      https://github.com/D-Programming-Language/phobos/commit/8153f095b7cd4970e2a6464797fd4056a40705e9
  Author: Walter Bright <walter at walterbright.com>
  Date:   2012-10-18 (Thu, 18 Oct 2012)

  Changed paths:
    M std/conv.d

  Log Message:
  -----------
  use intrinsic ldexp