[llvm] [DirectX][NFC] Model precise overload type specification of DXIL Ops (PR #83917)

[Chris B via llvm-commits]

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@@ -257,7 +257,7 @@ static FunctionCallee getOrCreateDXILOpFunction(dxil::OpCode DXILOp,
   // FIXME: find the issue and report error in clang instead of check it in
   // backend.
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llvm-beanz wrote:

This comment isn't accurate and we should remove it. Your change below does surface the error as we need it to.

https://github.com/llvm/llvm-project/pull/83917