[clang] [llvm] [HLSL][SPIRV]Add SPIRV generation for HLSL dot (PR #104656)

[Farzon Lotfi via llvm-commits]

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@@ -2157,6 +2221,16 @@ bool SPIRVInstructionSelector::selectIntrinsic(Register ResVReg,
     break;
   case Intrinsic::spv_thread_id:
     return selectSpvThreadId(ResVReg, ResType, I);
+  case Intrinsic::spv_fdot:
+    return BuildMI(BB, I, I.getDebugLoc(), TII.get(SPIRV::OpDot))
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farzonl wrote:

Maybe we should do a `selectDot` function? Would be more consistent with how all the other cases are setup. Also you are doing operand checks before addUse in `selectIntegerDot` that you aren't doing here.

https://github.com/llvm/llvm-project/pull/104656