[llvm] [ABI] Thread alloca address space through getNaturalAlignIndirect (PR #225301)

[Konstantinos Parasyris via llvm-commits]

https://github.com/koparasy approved this pull request.

This LGTM. A nit: Can we add some mock arch with a unittest with a fake target returning e.g. AS != 0.

https://github.com/llvm/llvm-project/pull/225301