[clang] [analyzer] Avoid overwriting the default binding of union aggregates in incomplete array initializers (PR #178694)

[Donát Nagy via cfe-commits]

NagyDonat wrote:

I started a test job, we have unused capacity. I'll probably post the results on Monday (if there is no instability, bug etc. in our test environment :sweat_smile:). 

https://github.com/llvm/llvm-project/pull/178694