[clang] [clang-tools-extra] [llvm] [clang] Fix false positive -Wmissing-field-initializer for anonymous unions (PR #70829)

[Richard Smith via cfe-commits]

================
@@ -727,6 +729,44 @@ void InitListChecker::FillInEmptyInitForField(unsigned 
Init, FieldDecl *Field,
     if (hadError || VerifyOnly) {
       // Do nothing
     } else if (Init < NumInits) {
----------------
zygoloid wrote:

Is it OK that we don't warn on the `else` case here? Do we still warn for:

```c++
struct A { int x, y; };
A a = {.x = 1}; // missing `.y` initializer
```

https://github.com/llvm/llvm-project/pull/70829
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