[Clang][Interp] Visit `DecompositionDecl` and create a local variable (#100400)

The following code should be well-formed:
```C++
float decompose_complex(_Complex float cf) {
  static _Complex float scf;
  auto &[sre, sim] = scf;
  // ok, this is references initialized by constant expressions all the way down
  static_assert(&sre == &__real scf);
  static_assert(&sim == &__imag scf);

  auto [re, im] = cf;
  return re*re + im*im;
}

```
We should visit `DecompositionDecl` and create a local variable but not
a create a dummy value directly.

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Signed-off-by: yronglin <yronglin777@gmail.com>

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