[llvm] [VPlan] Separate out logic to manage IR flags to VPIRFlags (NFC). (PR #140621)

[via llvm-commits]

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@@ -637,23 +637,10 @@ class VPRecipeWithIRFlags : public VPSingleDefRecipe {
     unsigned AllFlags;
   };
 
-protected:
-  void transferFlags(VPRecipeWithIRFlags &Other) {
-    OpType = Other.OpType;
-    AllFlags = Other.AllFlags;
-  }
-
 public:
-  VPRecipeWithIRFlags(const unsigned char SC, ArrayRef<VPValue *> Operands,
-                      DebugLoc DL = {})
-      : VPSingleDefRecipe(SC, Operands, DL) {
-    OpType = OperationType::Other;
-    AllFlags = 0;
-  }
+  VPIRFlags() : OpType(OperationType::Other), AllFlags(0) {}
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ayalz wrote:

Would be good to document the interface here and below.

https://github.com/llvm/llvm-project/pull/140621