Apply clang-tidy fixes for modernize-use-equals-default to MLIR (NFC)

mlir/lib/Analysis/Liveness.cpp

@@ -27,7 +27,7 @@ struct BlockInfoBuilder {
   using ValueSetT = Liveness::ValueSetT;
 
   /// Constructs an empty block builder.
-  BlockInfoBuilder() {}
+  BlockInfoBuilder() = default;
 
   /// Fills the block builder with initial liveness information.
   BlockInfoBuilder(Block *block) : block(block) {

mlir/lib/Dialect/Linalg/Transforms/ComprehensiveBufferizePass.cpp

@@ -36,8 +36,7 @@ struct LinalgComprehensiveModuleBufferize
   LinalgComprehensiveModuleBufferize() = default;
 
   LinalgComprehensiveModuleBufferize(
-      const LinalgComprehensiveModuleBufferize &p)
-      : LinalgComprehensiveModuleBufferizeBase(p) {}
+      const LinalgComprehensiveModuleBufferize &p) = default;
 
   void runOnOperation() override;
 

mlir/lib/Dialect/SparseTensor/Transforms/SparseTensorPasses.cpp

@@ -33,8 +33,7 @@ namespace {
 struct SparsificationPass : public SparsificationBase<SparsificationPass> {
 
   SparsificationPass() = default;
-  SparsificationPass(const SparsificationPass &pass)
-      : SparsificationBase<SparsificationPass>(pass) {}
+  SparsificationPass(const SparsificationPass &pass) = default;
 
   /// Returns parallelization strategy given on command line.
   SparseParallelizationStrategy parallelOption() {

mlir/lib/Pass/PassRegistry.cpp

@@ -508,7 +508,7 @@ namespace {
 /// This struct represents the possible data entries in a parsed pass pipeline
 /// list.
 struct PassArgData {
-  PassArgData() {}
+  PassArgData() = default;
   PassArgData(const PassRegistryEntry *registryEntry)
       : registryEntry(registryEntry) {}