[llvm] [llvm-debuginfo-analyzer] Remove `LVScope::Children` container (PR #144750)

[Carlos Alberto Enciso via llvm-commits]

CarlosAlbertoEnciso wrote:

@jalopezg-git I think the base branch for this patch should be https://github.com/llvm/llvm-project/pull/144744.
This patch should have only the changes to the `Children` container.

https://github.com/llvm/llvm-project/pull/144750