[llvm] [VPlan] Implement printing VPIRMetadata. (PR #165825)

[via llvm-commits]

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@@ -968,6 +968,12 @@ class VPIRMetadata {
   /// Intersect this VPIRMetada object with \p MD, keeping only metadata
   /// nodes that are common to both.
   void intersect(const VPIRMetadata &MD);
+
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ayalz wrote:

Under
```suggestion

#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
```
?

https://github.com/llvm/llvm-project/pull/165825