[clang] [llvm] [HLSL] Implement the `degrees` intrinsic (PR #111209)

[Finn Plummer via cfe-commits]

================
@@ -2625,6 +2645,8 @@ bool SPIRVInstructionSelector::selectIntrinsic(Register ResVReg,
     return selectFmix(ResVReg, ResType, I);
   case Intrinsic::spv_length:
     return selectLength(ResVReg, ResType, I);
+  case Intrinsic::spv_degrees:
+    return selectDegrees(ResVReg, ResType, I);
----------------
inbelic wrote:

Yep, you are right and I now realize I should also support the option to use the opencl lowering path which can be done using `selectExtInst`.

https://github.com/llvm/llvm-project/pull/111209