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

[Steffen Larsen 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; }
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steffenlarsen wrote:

`CIRDataLayout` already has some logic for this. Any way we could use at least parts of it and unify?

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