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

[Yingwei Zheng via cfe-commits]

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@@ -0,0 +1,175 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
+; See PR-70845 for more details
+; RUN: opt < %s -S -passes=instcombine | FileCheck %s
+
+
+define signext i32 @sext_sext(i16 %x, i16 %y) {
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dtcxzyw wrote:

Please drop unused `signext` and `noundef` flags.

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