[clang] [CIR][CUDA] Add semantic surface reference type (PR #223013)

[via cfe-commits]

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@@ -401,6 +401,20 @@ def CIR_VPtrType : CIR_Type<"VPtr", "vptr", [
   }];
 }
 
+//===----------------------------------------------------------------------===//
+// CUDADeviceSurfaceType
+//===----------------------------------------------------------------------===//
+
+def CIR_CUDADeviceSurfaceType :
+    CIR_Type<"CUDADeviceSurface", "cuda_surface"> {
+  let summary = "CUDA device surface reference type";
+  let description = [{
+    `!cir.cuda_surface` represents a CUDA built-in surface reference in CIR.
+    The type preserves surface semantics at the CIR level and is lowered to
+    the target device representation during lowering to LLVM IR.
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Siya-05 wrote:

Thanks! I’ve updated this to mention the NVPTX i64 representation. The adjacent CUDADeviceTextureType description uses the same “target device representation” wording. Should I also make it NVPTX-specific?

https://github.com/llvm/llvm-project/pull/223013