Revert "[mlir] Fix '-Wtemplate-id-cdtor'. NFC"
This reverts commit fccb65ef8f0faf40ca5dfaaa0ef70821f8843821.
It breaks pre-merge CI:
```
2025-12-08T16:35:11.7239054Z /home/gha/actions-runner/_work/llvm-project/llvm-project/mlir/lib/Pass/PassRegistry.cpp:439:37: error: ISO C++ requires the name after '::~' to be found in the same scope as the name before '::~' [-Werror,-Wdtor-name]
2025-12-08T16:35:11.7240458Z 439 | llvm::cl::OptionValue<OpPassManager>::~OptionValue() = default;
2025-12-08T16:35:11.7241014Z | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
2025-12-08T16:35:11.7241494Z | ::OptionValue
2025-12-08T16:35:11.7241903Z 1 error generated.
```
