[Midend]Use Declarative Pass Specification

[linuxlonelyeagle]

Is your feature request related to a problem? Please describe.
Now, the midend Passes are written in c++, which I don't think is elegant.Such passes are too spread out.
Here are my reasons.

• Using tablegen can make the code more stable
  The version of llvm is changing all the time, so maintaining the stability of the project is a problem, we should try our best to ensure stability and reduce the trouble when updating llvm.
• Reduce the amount of code in c++
  As an example, the automatically generated pass class contains the following.

  static constexpr ::llvm::StringLiteral getArgumentName() {
    return ::llvm::StringLiteral("xxx");
  }
  ::llvm::StringRef getArgument() const override { return "xxxx"; }

  ::llvm::StringRef getDescription() const override { return "xxx"; }

  /// Returns the derived pass name.
  static constexpr ::llvm::StringLiteral getPassName() {
    return ::llvm::StringLiteral("xxxx");
  }
  ::llvm::StringRef getName() const override { return "xxx"; }

  static bool classof(const ::mlir::Pass *pass) {
    return pass->getTypeID() == ::mlir::TypeID::get<DerivedT>();
  }

  friend std::unique_ptr<::mlir::Pass> createxxx0Pass() {
    return std::make_unique<DerivedT>();
  }
  inline void registerPasses() {
  registerxxx0Pass();
  registerxxx1Pass();
  registerxxx2Pass();
 }

• Make the code more intuitive
  This means I can use the pass like this
  buddy-opt xxx.mlir -my-pass="variable=false"
  I also know that this pass runs at the level of func.

def MyPass : Pass<"my-pass", "func::FuncOp"> {
  let summary = "xxxxx.";
  let options = [
   Option<"variable_", "variable", "bool",
           /*default=*/"true", "xxxxx">,
  ];
}

• Use Declarative Pass Specification Many communities use it
  The above are just some of the benefits I can think of, but I don't think that's all of them.

Describe the solution you'd like
I think you just need to understand what's going on here,then define all passes in a tablegen file.If you have questions, feel free to leave a comment below.