[clang] [llvm] [Instcombine] use zext's nneg flag for icmp folding (PR #70845)

[Nikita Popov via llvm-commits]

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+// RUN: %clang_cc1 %s -O2 -triple=x86_64-apple-darwin -emit-llvm -o - | FileCheck %s
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nikic wrote:

We don't test end-to-end codegen with clang. If you want to test this, you should take the unoptimized clang IR and create a test in the llvm/test/PhaseOrdering directory using it.

https://github.com/llvm/llvm-project/pull/70845