[clang] [clang] Fix a crash when a variable is captured by a block nested inside a lambda (PR #93749)

[Matheus Izvekov via cfe-commits]

https://github.com/mizvekov commented:

I see it stops crashing, but is it actually working now?

Why `hasInit` returns true, but the variable doesn't actually have an initializer?
Shouldn't the fix go there?

https://github.com/llvm/llvm-project/pull/93749