[BOLT][NFC] Clean includes, add license headers (#87200)

bolt/lib/Core/FunctionLayout.cpp

@@ -1,12 +1,17 @@
+//===- bolt/Core/FunctionLayout.cpp - Fragmented Function Layout -*- C++ -*-==//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
 #include "bolt/Core/FunctionLayout.h"
-#include "bolt/Core/BinaryFunction.h"
+#include "bolt/Core/BinaryBasicBlock.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/edit_distance.h"
 #include <algorithm>
-#include <cstddef>
-#include <functional>
 #include <iterator>
-#include <memory>
 
 using namespace llvm;
 using namespace bolt;