[llvm] [mlir] [IR][PGO] Verify invalid `MD_prof` metadata on instructions (PR #145576)

[Teresa Johnson via llvm-commits]

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@@ -5008,6 +5008,9 @@ void Verifier::visitProfMetadata(Instruction &I, MDNode *MD) {
       Check(mdconst::dyn_extract<ConstantInt>(MDO),
             "!prof brunch_weights operand is not a const int");
     }
+  } else {
+    Check(ProfName == "VP", "expected either branch_weights or VP profile name",
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teresajohnson wrote:

The PR description says that the validation "moved" - did this exist somewhere else already? 

https://github.com/llvm/llvm-project/pull/145576