[llvm] [VectorCombine] Fold reduce(trunc(x)) -> trunc(reduce(x)) iff cost effective (PR #81852)

[Simon Pilgrim via llvm-commits]

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@@ -29,6 +29,7 @@
 #include "llvm/IR/PatternMatch.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Transforms/Utils/Local.h"
+#include "llvm/Transforms/Utils/LoopUtils.h"
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RKSimon wrote:

Yes, the reduction intrinsics mapping helpers are all defined in LoopUtils.h

https://github.com/llvm/llvm-project/pull/81852