[llvm] [VPlan] Add poisoning value handle for VPValue. (NFCI) (PR #185054)

[Florian Hahn via llvm-commits]

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@@ -152,6 +152,62 @@ VPRecipeValue::~VPRecipeValue() {
   Def->removeDefinedValue(this);
 }
 
+#if LLVM_ENABLE_ABI_BREAKING_CHECKS && !defined(NDEBUG)
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fhahn wrote:

I don't think  there's anything preventing this from being used, as part of the C++ API, not sure; Removed `LLVM_ENABLE_ABI_BREAKING_CHECKS` for now

https://github.com/llvm/llvm-project/pull/185054