[llvm-branch-commits] [llvm] [mlir] [WIP][IR][Constants] Change the semantic of `ConstantPointerNull` to represent an actual `nullptr` instead of a zero-value pointer (PR #183215)

[Matt Arsenault via llvm-branch-commits]

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@@ -409,8 +467,10 @@ Constant *Constant::getZeroValue(Type *Ty) {
   case Type::PPC_FP128TyID:
     return ConstantFP::get(Ty->getContext(),
                            APFloat::getZero(Ty->getFltSemantics()));
-  case Type::PointerTyID:
-    return ConstantPointerNull::get(cast<PointerType>(Ty));
+  case Type::PointerTyID: {
+    auto *Zero = ConstantInt::get(Type::getInt8Ty(Ty->getContext()), 0);
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arsenm wrote:

ConstantInt::getZero 

https://github.com/llvm/llvm-project/pull/183215
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