Revert "Reland [flang] Generalized simplification of HLFIR reduction ops. (#136071)"

This reverts commit 32311a6.

Author: vzakhari

Diff for: flang/include/flang/Optimizer/Builder/HLFIRTools.h

@@ -301,11 +301,6 @@ mlir::Value genExtent(mlir::Location loc, fir::FirOpBuilder &builder,
 mlir::Value genLBound(mlir::Location loc, fir::FirOpBuilder &builder,
                       hlfir::Entity entity, unsigned dim);
 
-/// Compute the lower bounds of \p entity, which is an array of known rank.
-llvm::SmallVector<mlir::Value> genLBounds(mlir::Location loc,
-                                          fir::FirOpBuilder &builder,
-                                          hlfir::Entity entity);
-
 /// Generate a vector of extents with index type from a fir.shape
 /// of fir.shape_shift value.
 llvm::SmallVector<mlir::Value> getIndexExtents(mlir::Location loc,

Diff for: flang/lib/Optimizer/Builder/HLFIRTools.cpp

@@ -659,33 +659,6 @@ mlir::Value hlfir::genLBound(mlir::Location loc, fir::FirOpBuilder &builder,
   return dimInfo.getLowerBound();
 }
 
-llvm::SmallVector<mlir::Value> hlfir::genLBounds(mlir::Location loc,
-                                                 fir::FirOpBuilder &builder,
-                                                 hlfir::Entity entity) {
-  assert(!entity.isAssumedRank() &&
-         "cannot compute all lower bounds for assumed rank");
-  assert(!entity.isScalar() && "expected an array entity");
-  int rank = entity.getRank();
-  mlir::Type idxTy = builder.getIndexType();
-  if (!entity.mayHaveNonDefaultLowerBounds())
-    return {static_cast<std::size_t>(rank),
-            builder.createIntegerConstant(loc, idxTy, 1)};
-
-  if (auto shape = tryRetrievingShapeOrShift(entity)) {
-    auto lbounds = getExplicitLboundsFromShape(shape);
-    if (!lbounds.empty())
-      return lbounds;
-  }
-
-  if (entity.isMutableBox())
-    entity = hlfir::derefPointersAndAllocatables(loc, builder, entity);
-
-  llvm::SmallVector<mlir::Value> lbounds;
-  fir::factory::genDimInfoFromBox(builder, loc, entity, &lbounds,
-                                  /*extents=*/nullptr, /*strides=*/nullptr);
-  return lbounds;
-}
-
 void hlfir::genLengthParameters(mlir::Location loc, fir::FirOpBuilder &builder,
                                 Entity entity,
                                 llvm::SmallVectorImpl<mlir::Value> &result) {