[flang][hlfir] remove unnecessary header include

[jeanPerier]

Summary

Builder/HLFIRTools.h is not needed and is causing build
issues in some shared library builds because it belongs to another
library that depends on libHLFIRDialect (so libHLFIRDialect should
not depend on it).

[clementval]

LGTM

[tblah]

LGTM, thanks for catching this

flang/lib/Optimizer/HLFIR/IR/HLFIROps.cpp

 //===-- HLFIROps.cpp ------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // Coding style: https://mlir.llvm.org/getting_started/DeveloperGuide/
 //
 //===----------------------------------------------------------------------===//
 
 #include "flang/Optimizer/HLFIR/HLFIROps.h"
-#include "flang/Optimizer/Builder/HLFIRTools.h"
 #include "flang/Optimizer/Dialect/FIROpsSupport.h"
 #include "flang/Optimizer/Dialect/FIRType.h"
 #include "flang/Optimizer/HLFIR/HLFIRDialect.h"
 #include "mlir/IR/Builders.h"
 #include "mlir/IR/BuiltinTypes.h"
 #include "mlir/IR/DialectImplementation.h"
 #include "mlir/IR/Matchers.h"
 #include "mlir/IR/OpImplementation.h"