[clang] [llvm] [HLSL][SPIR-V] Add SV_DispatchThreadID semantic support (PR #82536)

[Natalie Chouinard via cfe-commits]

================
@@ -1427,6 +1432,8 @@ bool SPIRVInstructionSelector::selectIntrinsic(Register 
ResVReg,
           .addUse(I.getOperand(2).getReg())
           .addUse(I.getOperand(3).getReg());
     break;
+  case Intrinsic::dx_thread_id:
+    return selectDXThreadId(ResVReg, ResType, I);
----------------
sudonatalie wrote:

Thanks, I was surprised that it worked but didn't know whether that indicated 
it was by design or accident. I added an analogous SPIR-V intrinsic.

https://github.com/llvm/llvm-project/pull/82536
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