[llvm] [SelectionDAG] Mark LowerTypeTests as required and remove intrinsic handling from #142939 (PR #179249)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon requested changes to this pull request.

(style) don't clang-format lines irrelevant to the patch

https://github.com/llvm/llvm-project/pull/179249