[clang] [CIR] Upstream `AddressSpace` support for `PointerType` (PR #161028)

[Andy Kaylor via cfe-commits]

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@@ -35,6 +38,13 @@ bool isValidFundamentalIntWidth(unsigned width);
 /// void, or abstract types.
 bool isSized(mlir::Type ty);
 
+//===----------------------------------------------------------------------===//
+// AddressSpace helpers
+//===----------------------------------------------------------------------===//
+
+/// Returns the integer value of a CIR address space for LLVM.
+unsigned getTargetAddrSpaceFromAttr(cir::TargetAddressSpaceAttr attr);
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andykaylor wrote:

This isn't necessary. You can just retrieve the value directly from the attribute.

https://github.com/llvm/llvm-project/pull/161028