[llvm] [mlir] eliminating g++ warnings (PR #105520)

[Matt Arsenault via llvm-commits]

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@@ -94,6 +94,7 @@ class Pass {
     Option(Pass &parent, StringRef arg, Args &&...args)
         : detail::PassOptions::Option<DataType, OptionParser>(
               parent.passOptions, arg, std::forward<Args>(args)...) {}
+    Option &operator=(const Option &other) = default; // gcc11 -Wdeprecated-copy
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arsenm wrote:

The comment doesn't really mean anything to me, and I don't think it's helpful or necessary 

https://github.com/llvm/llvm-project/pull/105520