[clang] [clang-tools-extra] [clang] more useful error message for decomposition declaration missing initializer (PR #127924)

[Yanzuo Liu via cfe-commits]

zwuis wrote:

Please add/modify some tests:

```cpp
auto [a, b]
    S // expected-error
    = {1, 2}
```

so that we can verify that the error points to the `S`. Thanks!

https://github.com/llvm/llvm-project/pull/127924
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