[flang][HLFIR][NFC] Reduce BufferizeHLFIR pass boilerplate (llvm#93161)

The pass constructor can be generated automatically.

This pass is module-level and then runs on all of the relevant HLFIR
operations inside of the module, no matter what top level operation they
are inside of.

Author: tblah

flang/include/flang/Optimizer/HLFIR/Passes.h

@@ -23,7 +23,6 @@ namespace hlfir {
 #include "flang/Optimizer/HLFIR/Passes.h.inc"
 
 std::unique_ptr<mlir::Pass> createConvertHLFIRtoFIRPass();
-std::unique_ptr<mlir::Pass> createBufferizeHLFIRPass();
 
 #define GEN_PASS_REGISTRATION
 #include "flang/Optimizer/HLFIR/Passes.h.inc"

flang/include/flang/Optimizer/HLFIR/Passes.td

@@ -20,7 +20,6 @@ def ConvertHLFIRtoFIR : Pass<"convert-hlfir-to-fir", "::mlir::ModuleOp"> {
 
 def BufferizeHLFIR : Pass<"bufferize-hlfir", "::mlir::ModuleOp"> {
   let summary = "Convert HLFIR operations operating on hlfir.expr into operations on memory";
-  let constructor = "hlfir::createBufferizeHLFIRPass()";
 }
 
 def OptimizedBufferization : Pass<"opt-bufferization"> {

flang/include/flang/Tools/CLOptions.inc

@@ -330,7 +330,7 @@ inline void createHLFIRToFIRPassPipeline(
   }
   pm.addPass(hlfir::createLowerHLFIROrderedAssignments());
   pm.addPass(hlfir::createLowerHLFIRIntrinsics());
-  pm.addPass(hlfir::createBufferizeHLFIRPass());
+  pm.addPass(hlfir::createBufferizeHLFIR());
   pm.addPass(hlfir::createConvertHLFIRtoFIRPass());
 }
 

flang/lib/Optimizer/HLFIR/Transforms/BufferizeHLFIR.cpp

@@ -944,7 +944,3 @@ class BufferizeHLFIR : public hlfir::impl::BufferizeHLFIRBase<BufferizeHLFIR> {
   }
 };
 } // namespace
-
-std::unique_ptr<mlir::Pass> hlfir::createBufferizeHLFIRPass() {
-  return std::make_unique<BufferizeHLFIR>();
-}