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