[llvm] [SCCP] Add support for trunc nuw range. (PR #152990)

[Mikael Holmén via llvm-commits]

mikaelholmen wrote:

> Ok, so that's where the input is already broken becuase the input to it is 0xffec (-20). Then I'll go hunt down whoever added the nuw to the trunc.

I blame separate-const-offset-from-gep:
 https://github.com/llvm/llvm-project/issues/154116

https://github.com/llvm/llvm-project/pull/152990