[llvm] [VPlan] Assert vplan-verify-each result and get verifier passing (PR #182254)

[Luke Lau via llvm-commits]

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@@ -72,8 +72,10 @@ struct VPlanTransforms {
           dbgs() << Plan << '\n';
       }
 #endif
-      if (VerifyEachVPlan && EnableVerify)
-        verifyVPlanIsValid(Plan);
+      if (VerifyEachVPlan && EnableVerify) {
+        [[maybe_unused]] bool IsValid = verifyVPlanIsValid(Plan);
+        assert(IsValid && "VPlan is invalid");
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lukel97 wrote:

Switched to report_fatal_error in 9401b48051b8. I copied the same error format from the IR verifier.

https://github.com/llvm/llvm-project/pull/182254