[llvm] [AMDGPU] Add buffer.fat.ptr.load.lds intrinsic wrapping raw rsrc version (PR #133015)

[Krzysztof Drewniak via llvm-commits]

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@@ -1939,6 +1939,27 @@ def int_amdgcn_s_buffer_prefetch_data : DefaultAttrsIntrinsic <
 
 } // defset AMDGPUBufferIntrinsics
 
+// A wrapper around raw_ptr_buffer_load_lds that takes the global offset
+// from the addrspace(7) pointer argument.
+def int_amdgcn_buffer_fat_ptr_load_lds : Intrinsic <
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krzysz00 wrote:

The point of this thing is to let you pass in a `ptr addrspace(7) fatptr` instead of `(ptr addrspace(8 rsrc, i32 voffset)` to `raw.ptr.buffer.load.lds`, thus allowing the load operation and all the GEPs leading up to it to be visible to LLVM

https://github.com/llvm/llvm-project/pull/133015