[llvm] [SCEV] Support larger than 64-bit types in ashr(add(shl(x, n), c), m) (PR #71600)

[Vedant Paranjape via llvm-commits]

https://github.com/vedantparanjape-amd approved this pull request.

Thanks for the fix, I really didn't think about this scenario while using getZExtValue() !

LGTM !

https://github.com/llvm/llvm-project/pull/71600