[llvm] [ABI] Thread alloca address space through getNaturalAlignIndirect (PR #225301)

[via llvm-commits]

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@@ -80,21 +80,22 @@ class TargetInfo {
   /// store a derived object and return that as an ABICompatInfo reference.
   virtual const ABICompatInfo &getABICompatInfo() const = 0;
 
+  /// Address space in which indirect arguments are allocated (the target's
+  /// alloca/stack space).
+  virtual unsigned getAllocaAddrSpace() const { return 0; }
+
 protected:
   LLVM_ABI RecordArgABI getRecordArgABI(const RecordType *RT) const;
   LLVM_ABI RecordArgABI getRecordArgABI(const Type *Ty) const;
   LLVM_ABI bool isPromotableInteger(const IntegerType *IT) const;
-  LLVM_ABI ArgInfo getNaturalAlignIndirect(const Type *Ty,
+  LLVM_ABI ArgInfo getNaturalAlignIndirect(const Type *Ty, unsigned AddrSpace,
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skc7 wrote:

Thanks @andykaylor for feedback. 
For now I'd like to keep AddrSpace as an explicit parameter to mirror classic's `ABIInfo::getNaturalAlignIndirect`. Happy to internalize it as a follow-up if we decide to simplify later.

https://github.com/llvm/llvm-project/pull/225301