[compiler-rt] FuzzedDataProvider: Add PickValueInArray for std::array

This makes `PickValueInArray` work for `std::array<T, s>` (C++11). I've also tested the C++17 `std::array` (with compiler-deduced template parameters)

```
Author:
MarcoFalke <falke.marco@gmail.com>
```

Reviewed By: Dor1s

Differential Revision: https://reviews.llvm.org/D93412