[clang] [llvm] [AMDGPU] Extend __builtin_amdgcn_ds_bpermute argument types (PR #153501)

[Matt Arsenault via llvm-commits]

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@@ -13598,4 +13598,8 @@ def warn_acc_var_referenced_lacks_op
 // AMDGCN builtins diagnostics
 def err_amdgcn_load_lds_size_invalid_value : Error<"invalid size value">;
 def note_amdgcn_load_lds_size_valid_value : Note<"size must be %select{1, 2, or 4|1, 2, 4, 12 or 16}0">;
+def warn_amdgcn_builtin_arg_truncation
+    : Warning<"the %0-bit argument will be truncated to %1 bits in this call "
+              "to %2">,
+      InGroup<DiagGroup<"amdgcn-builtin-arg-trunc">>;
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arsenm wrote:

I don't think this should permit or require special truncation 

https://github.com/llvm/llvm-project/pull/153501