[clang-tools-extra] [llvm] [SimplifyCFG] Find the minimal table considering overflow in `switchToLookupTable` (PR #67885)

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DianQK wrote:

I apologize for the delayed response to the PR. I have resolved all regressions.
When a signed max-min cannot construct a lookup table, fall back to the min lookup table.

https://github.com/llvm/llvm-project/pull/67885