[llvm] [TableGen] Bug fix for tied optional operands resolution (PR #83588)

[Sergei Barannikov via llvm-commits]

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@@ -1992,6 +1992,7 @@ emitConvertFuncs(CodeGenTarget &Target, StringRef ClassName,
     // When optional operands are involved, formal and actual operand indices
     // may differ. Map the former to the latter by subtracting the number of
     // absent optional operands.
+    // FIXME: This is not an operand index in the CVT_Tied case
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s-barannikov wrote:

Nice, thanks.

https://github.com/llvm/llvm-project/pull/83588