[llvm] [SCEV] Add test coverage for ext-nusw/nsuw inference (PR #218943)

[Florian Hahn via llvm-commits]

================
@@ -1,26 +0,0 @@
-; RUN: opt -disable-output "-passes=print<scalar-evolution>,print<scalar-evolution>" < %s 2>&1 | FileCheck %s
----------------
fhahn wrote:

Not sure if the double invocation of printing was needed originally to expose the issue, I don't think running the printing twice can expose any order-dependencies, as the second run will just look up the cached values?

https://github.com/llvm/llvm-project/pull/218943