[clang] [clang][dataflow] Expose simple access to child StorageLocation presence. (PR #145520)

[Samira Bakon via cfe-commits]

bazuzi wrote:

No underlying bug, but I was able to simplify my approach out-of-tree and avoid exposing this function that doesn't capture the intended semantics.

I'll revert this.

https://github.com/llvm/llvm-project/pull/145520