[clang] [llvm] [AMDGPU] Add a new builtin type for image descriptor rsrc (PR #160258)

[Matt Arsenault via llvm-commits]

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@@ -34,6 +34,7 @@
 //  Q -> target builtin type, followed by a character to distinguish the builtin type
 //    Qa -> AArch64 svcount_t builtin type.
 //    Qb -> AMDGPU __amdgpu_buffer_rsrc_t builtin type.
+//    Qc -> AMDGPU __amdgpu_image_desc_t builtin type.
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arsenm wrote:

Why "c"? It's an image. @jayfoad do you have any naming suggestions for the type? Based on the manual I'm not sure what to call this. The encoding field is called "srsrc", and seem to refer to this as "image resource constant (T#)"

https://github.com/llvm/llvm-project/pull/160258