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

[Farzon Lotfi via cfe-commits]

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@@ -770,6 +770,15 @@ def CheckAccessFullyMapped : DXILOp<71, 
checkAccessFullyMapped> {
   let stages = [Stages<DXIL1_0, [all_stages]>];
 }
 
+def Discard : DXILOp<82, discard> {
+  let Doc = "discard the current pixel";
+  let LLVMIntrinsic = int_dx_discard;
+  let arguments = [Int1Ty];
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farzonl wrote:

should we have any error tests to make sure `discard` only will work on bool 
args?

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