[llvm] [SimplifyCFG] Support trunc nuw in chain of comparisons. (PR #155087)

[Andreas Jonson via llvm-commits]

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@@ -612,6 +612,15 @@ struct ConstantComparesGatherer {
   /// If CompValue is already set, the function is expected to fail if a match
   /// is found but the value compared to is different.
   bool matchInstruction(Instruction *I, bool isEQ) {
+    Value *Val;
+    if (!isEQ && match(I, m_NUWTrunc(m_Value(Val)))) {
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andjo403 wrote:

Good catch, this was a more common case.

https://github.com/llvm/llvm-project/pull/155087