[llvm] [DAG] Extend the computeOverflowForSignedSub/computeOverflowForUnsignedSub implementations with ConstantRange (PR #67890)

[Aaron Jarmusch via llvm-commits]

ajarmusch wrote:

@RKSimon sure thing

the commit [632022e](https://github.com/llvm/llvm-project/commit/632022e61c544280685763333685b4743f105f2e) shows up in the [artifacts](https://gitlab.e4s.io/uo-public/llvm-sollve/-/jobs/222987/artifacts/file/artifacts/llvm-project-commit.txt)

https://github.com/llvm/llvm-project/pull/67890