[clang] [llvm] [mlir] [Clang][CodeGen] Start migrating away from assuming the Default AS is 0 (PR #88182)

[Matt Arsenault via cfe-commits]

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@@ -368,7 +368,8 @@ CodeGenModule::CodeGenModule(ASTContext &C,
   IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth());
   IntPtrTy = llvm::IntegerType::get(LLVMContext,
     C.getTargetInfo().getMaxPointerWidth());
-  Int8PtrTy = llvm::PointerType::get(LLVMContext, 0);
+  Int8PtrTy = llvm::PointerType::get(LLVMContext,
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arsenm wrote:

The IR address space is a pure target concept. Any address space error would be 
on the frontend emitting the wrong IR for the target 

https://github.com/llvm/llvm-project/pull/88182
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