[clang] [llvm] [ValueTracking] Extend computeConstantRange for add/sub, sext/zext/trunc (PR #181110)

[Guy David via cfe-commits]

guy-david wrote:

My bad for missing that. What do you think about adding a fully recursive variant of `computeConstantRange` so the rest of the users won't be affected?

https://github.com/llvm/llvm-project/pull/181110