[clang] [llvm] [HLSL] Use hlsl_device address space for getpointer. (PR #127675)

[Chris B via cfe-commits]

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@@ -94,6 +94,11 @@ bool Qualifiers::isTargetAddressSpaceSupersetOf(LangAS A, LangAS B,
          (A == LangAS::Default &&
           (B == LangAS::cuda_constant || B == LangAS::cuda_device ||
            B == LangAS::cuda_shared)) ||
+         // In HLSL, the this pointer for member functions is in the default
+         // address space. This causes problem if the structure is in
+         // hlsl_device. We want to allow casting from hlsl_device to default
+         // until a proper solution for that issue is found.
+         (A == LangAS::Default && B == LangAS::hlsl_device) ||
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llvm-beanz wrote:

Can we make any member function that has an addressspace cast on the implicit object also `alwaysinline` at the call site? That would allow us to side-step any issues with `noinline`.

To avoid the language being completely unwieldy I think we're going to need to support some mechanism for allowing implicit objects in different address spaces.

https://github.com/llvm/llvm-project/pull/127675