[flang][NFC] Use tablegen to create SimplifyIntrinsics constructor (#89963)

This pass runs on ModuleOp, internally walking all func::CallOps so it
shouldn't need anything special to work on other top level operations.

Author: tblah

flang/include/flang/Optimizer/Transforms/Passes.h

@@ -60,7 +60,6 @@ std::unique_ptr<mlir::Pass> createPromoteToAffinePass();
 std::unique_ptr<mlir::Pass> createMemoryAllocationPass();
 std::unique_ptr<mlir::Pass> createStackArraysPass();
 std::unique_ptr<mlir::Pass> createAliasTagsPass();
-std::unique_ptr<mlir::Pass> createSimplifyIntrinsicsPass();
 std::unique_ptr<mlir::Pass>
 createAddDebugInfoPass(fir::AddDebugInfoOptions options = {});
 std::unique_ptr<mlir::Pass> createLoopVersioningPass();

flang/include/flang/Optimizer/Transforms/Passes.td

@@ -224,7 +224,6 @@ def SimplifyIntrinsics : Pass<"simplify-intrinsics", "mlir::ModuleOp"> {
     simplified function. The simplified function is added to the current module.
     This function can be inlined by a general purpose inlining pass.
   }];
-  let constructor = "::fir::createSimplifyIntrinsicsPass()";
 
   let options = [
     Option<"enableExperimental", "enable-experimental", "bool",

flang/include/flang/Tools/CLOptions.inc

@@ -248,7 +248,7 @@ inline void createDefaultFIROptimizerPassPipeline(
   pm.addPass(fir::createSimplifyRegionLite());
   if (pc.OptLevel.isOptimizingForSpeed()) {
     // These passes may increase code size.
-    pm.addPass(fir::createSimplifyIntrinsicsPass());
+    pm.addPass(fir::createSimplifyIntrinsics());
     pm.addPass(fir::createAlgebraicSimplificationPass(config));
   }
 

flang/lib/Optimizer/Transforms/SimplifyIntrinsics.cpp

@@ -72,6 +72,9 @@ class SimplifyIntrinsicsPass
       mlir::Type elementType)>;
 
 public:
+  using fir::impl::SimplifyIntrinsicsBase<
+      SimplifyIntrinsicsPass>::SimplifyIntrinsicsBase;
+
   /// Generate a new function implementing a simplified version
   /// of a Fortran runtime function defined by \p basename name.
   /// \p typeGenerator is a callback that generates the new function's type.
@@ -1387,6 +1390,3 @@ void SimplifyIntrinsicsPass::getDependentDialects(
   // LLVM::LinkageAttr creation requires that LLVM dialect is loaded.
   registry.insert<mlir::LLVM::LLVMDialect>();
 }
-std::unique_ptr<mlir::Pass> fir::createSimplifyIntrinsicsPass() {
-  return std::make_unique<SimplifyIntrinsicsPass>();
-}