[llvm] [VPlan] Preserve trunc nuw/nsw in VPRecipeWithIRFlags (PR #144700)

[Florian Hahn via llvm-commits]

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@@ -612,6 +613,13 @@ class VPIRFlags {
     WrapFlagsTy(bool HasNUW, bool HasNSW) : HasNUW(HasNUW), HasNSW(HasNSW) {}
   };
 
+  struct TruncFlagsTy {
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fhahn wrote:

It might be enough to add a new op-type for trunc, but still use `WrapFlagsTy` to store the flags. This should  keep the symmetry with LLVM IR in terms of instruction classification and be enough to guard against querying new flags for OverflowingBinOp for Truncs.

https://github.com/llvm/llvm-project/pull/144700