Struct initializers allow missing fields

struct BuildData {
    foo: int,
    bar: ~int
}

fn main() {
    let foo = BuildData {
        foo: 0
    };

    debug!("%?", foo.bar);
}

This will crash

There is code for this in check_struct_or_variant_fields that doesn't seem to be working. There aren't tests.

This is more or less the same bug as #3486, different manifestations.

Auto merge of rust-lang#3892 - rust-lang:rustup-2024-09-16, r=RalfJung

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