Changing "target" parameter via attribute

[Manu]

So we talked about this at DConf.

Working on std.simd, I need to be able to change the target parameter on a
per-function basis.
GCC supports this via: __attribute__((target("sse2"))) for instance.

I need the ability to set this from D, but the trick is, I need to be able
to set the target string according to a template arg.

Eg:
  enum Targets { SSE2, SSE3 };
  enum targets[] = [ "sse2", "sse3" ];

  @attribute("target", targets[T]) // <- attribute needs to refer to the
template arg T
  void func(Targets T)();


  {
    // this way, it is possibly to produce dynamic selection of code paths
optimised for different CPU features (a task which is usually very tedious
in C/C++)
    func!(Targets.SSE2)();
  }
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