[mlir] Fix warning `missing base in copy ctor`

[javedabsar]

Summary

This suppresse annoying warning when building mlir.

warning: base class ‘class mlir::PassWrapper<{anonymous}::TestStatisticPass,
 mlir::OperationPass<void> >’ should be explicitly initialized in the copy constructor [-Wextra]

[rriddle]

Thanks!

mlir/test/lib/Pass/TestPassManager.cpp

65

171

mlir/test/lib/Pass/TestPassManager.cpp

struct Options : public PassPipelineOptions<Options> {
     ListOption<int> listOption{*this, "list",
                                llvm::cl::desc("Example list option")};
     ListOption<std::string> stringListOption{
         *this, "string-list", llvm::cl::desc("Example string list option")};
     Option<std::string> stringOption{*this, "string",
                                      llvm::cl::desc("Example string option")};
   };
   TestOptionsPass() = default;
-  TestOptionsPass(const TestOptionsPass &) {}
+  TestOptionsPass(const TestOptionsPass &) : PassWrapper() {}
   TestOptionsPass(const Options &options) {
     listOption = options.listOption;
     stringOption = options.stringOption;
     stringListOption = options.stringListOption;
   }
 
   void runOnOperation() final {}
   StringRef getArgument() const final { return "test-options-pass"; }

 };
 
 /// A test pass that contains a statistic.
 struct TestStatisticPass
     : public PassWrapper<TestStatisticPass, OperationPass<>> {
   MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestStatisticPass)
 
   TestStatisticPass() = default;
-  TestStatisticPass(const TestStatisticPass &) {}
+  TestStatisticPass(const TestStatisticPass &) : PassWrapper() {}
   StringRef getArgument() const final { return "test-stats-pass"; }
   StringRef getDescription() const final { return "Test pass statistics"; }
 
   Statistic opCount{this, "num-ops", "Number of operations counted"};
 
   void runOnOperation() final {
     getOperation()->walk([&](Operation *) { ++opCount; });
   }