Merge #288

288: Fix crash with zero length array r=philberty a=YizhePKU

This PR fixes the crash that results from zero-length arrays, such as `let arr = []`(issue #260). `ArrayExpr` now uses `ArrayElemsValues` to represent an empty array like that, instead of `nullptr`.

However, currently such code still doesn't compile. Four tests were added, two of which report an error:

```Rust
// compilable/array_empty_list.rs
fn main() {
    let arr = [];
}

// rust1: error: unable to determine type: please give this a type: 24
```

```Rust
// compilable/array_zero_length_fold.rs
fn main() {
    let arr = ["Hello"; 123 - 123];
}

// array_zero_length_fold.rs:2:25: fatal error: failed to fold capacity constant
```

I think these are best treated as separate bugs. We can merge first and fix later, or we can delay this PR. Either is OK.

Co-authored-by: Yizhe <yizhe@pku.edu.cn>
Co-authored-by: YizhePKU <yizhe@pku.edu.cn>
Co-authored-by: YizhePKU <42838469+YizhePKU@users.noreply.github.com>

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