[clang] [llvm] [HLSL] Adding HLSL `clip` function. (PR #114588)

[via cfe-commits]

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@@ -89,6 +89,7 @@ let TargetPrefix = "spv" in {
   def int_spv_sign : DefaultAttrsIntrinsic<[LLVMScalarOrSameVectorWidth<0, 
llvm_i32_ty>], [llvm_any_ty], [IntrNoMem]>;
   def int_spv_radians : DefaultAttrsIntrinsic<[LLVMMatchType<0>], 
[llvm_anyfloat_ty], [IntrNoMem]>;
   def int_spv_group_memory_barrier_with_group_sync : DefaultAttrsIntrinsic<[], 
[], []>;
+  def int_spv_clip : Intrinsic<[], [], []>;
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joaosaffran wrote:

This intrinsic has side effects, it discards the current pixel, therefore it 
cannot use `IntrNoMem`

https://github.com/llvm/llvm-project/pull/114588
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