[llvm] [SimplifyCFG] Use indexType from data layout in switch to table conversion (PR #146207)

[Nikita Popov via llvm-commits]

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

LGTM. Independently of whether this fixes a specific issue, this is the right thing to do...

https://github.com/llvm/llvm-project/pull/146207