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

[Rana Pratap Reddy via cfe-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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ranapratap55 wrote:

Initially I thought of using "i" as for "image" but used "c" as it is next alphabet. I will modify as "i" if it is ok. @jayfoad 

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