[llvm] [VPlan] Implement printing VPIRMetadata. (PR #168385)

[Mel Chen via llvm-commits]

================
@@ -507,6 +507,11 @@ void VPRecipeBase::print(raw_ostream &O, const Twine &Indent,
     O << ", !dbg ";
     DL.print(O);
   }
+
+  if (auto *Metadata = dyn_cast<VPIRMetadata>(this)) {
+    if (const VPBasicBlock *Parent = getParent())
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Mel-Chen wrote:

Could a recipe have no parent basic block?

https://github.com/llvm/llvm-project/pull/168385