[DebugInfo] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC).

llvm-svn: 296413
diff --git a/llvm/lib/DebugInfo/DWARF/DWARFDebugArangeSet.cpp b/llvm/lib/DebugInfo/DWARF/DWARFDebugArangeSet.cpp
index 67589cd..ed5d726a 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFDebugArangeSet.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFDebugArangeSet.cpp
@@ -1,4 +1,4 @@
-//===-- DWARFDebugArangeSet.cpp -------------------------------------------===//
+//===- DWARFDebugArangeSet.cpp --------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -10,8 +10,11 @@
 #include "llvm/DebugInfo/DWARF/DWARFDebugArangeSet.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/raw_ostream.h"
-#include <algorithm>
 #include <cassert>
+#include <cinttypes>
+#include <cstdint>
+#include <cstring>
+
 using namespace llvm;
 
 void DWARFDebugArangeSet::clear() {