[iwyu] Handle regressions in libLLVM header include

[serge-sans-paille]

Summary

Running iwyu-diff on LLVM codebase since fb67d683db46dfd88da09d99 detected a few
regressions, fixing them.

The impact on preprocessed output is negligible: -4k lines.

[RKSimon]

LGTM - are these new (unnecessary) additions or has the code been changed to remove a dependency?

[serge-sans-paille]

@RKSimon: I don't track the origin of the change, I can't tell...

[serge-sans-paille]

oh, and I landed that one while forgetting to link it to phabricator, this patch landed as 27fd01d3f88c1996fc000b6e139b50a600879fde

llvm/include/llvm/MC/MCWinEH.h

 //===- MCWinEH.h - Windows Unwinding Support --------------------*- 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
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_MC_MCWINEH_H
 #define LLVM_MC_MCWINEH_H
 
-#include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/MapVector.h"
 #include <vector>
 
 namespace llvm {
 class MCSection;
 class MCStreamer;
 class MCSymbol;
 

llvm/lib/DebugInfo/DWARF/DWARFDie.cpp

 #include "llvm/DebugInfo/DWARF/DWARFTypePrinter.h"
 #include "llvm/DebugInfo/DWARF/DWARFTypeUnit.h"
 #include "llvm/DebugInfo/DWARF/DWARFUnit.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/DataExtractor.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/MathExtras.h"
-#include "llvm/Support/ScopedPrinter.h"
 #include "llvm/Support/WithColor.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cassert>
 #include <cinttypes>
 #include <cstdint>
 #include <string>
 #include <utility>
 

llvm/lib/ExecutionEngine/JITLink/ELF_aarch64.cpp

 #include "EHFrameSupportImpl.h"
 #include "ELFLinkGraphBuilder.h"
 #include "JITLinkGeneric.h"
 #include "llvm/BinaryFormat/ELF.h"
 #include "llvm/ExecutionEngine/JITLink/DWARFRecordSectionSplitter.h"
 #include "llvm/ExecutionEngine/JITLink/aarch64.h"
 #include "llvm/Object/ELFObjectFile.h"
 #include "llvm/Support/Endian.h"
-#include "llvm/Support/MathExtras.h"
 
 #define DEBUG_TYPE "jitlink"
 
 using namespace llvm;
 using namespace llvm::jitlink;
 
 namespace {
 

llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCCodeEmitter.h

 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIB_TARGET_AMDGPU_MCTARGETDESC_AMDGPUMCCODEEMITTER_H
 #define LLVM_LIB_TARGET_AMDGPU_MCTARGETDESC_AMDGPUMCCODEEMITTER_H
 
 #include "llvm/ADT/APInt.h"
 #include "llvm/MC/MCCodeEmitter.h"
-#include <cstdint>
 
 namespace llvm {
 
 class MCInst;
 class MCInstrInfo;
 class MCOperand;
 class MCSubtargetInfo;
 class FeatureBitset;

llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp

 //
 //===----------------------------------------------------------------------===//
 
 #include "ARMRegisterInfo.h"
 #include "ARMUnwindOpAsm.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/Triple.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/BinaryFormat/ELF.h"
 #include "llvm/MC/MCAsmBackend.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCCodeEmitter.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCELFStreamer.h"

llvm/lib/Target/ARM/MCTargetDesc/ARMMachObjectWriter.cpp

 //===-- ARMMachObjectWriter.cpp - ARM Mach Object Writer ------------------===//
 //
 // 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 "MCTargetDesc/ARMBaseInfo.h"
 #include "MCTargetDesc/ARMFixupKinds.h"
 #include "MCTargetDesc/ARMMCTargetDesc.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/BinaryFormat/MachO.h"
 #include "llvm/MC/MCAsmLayout.h"
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCFixup.h"
 #include "llvm/MC/MCFixupKindInfo.h"
 #include "llvm/MC/MCMachObjectWriter.h"
 #include "llvm/MC/MCSection.h"
 #include "llvm/MC/MCValue.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/ScopedPrinter.h"
 
 using namespace llvm;
 
 namespace {
 class ARMMachObjectWriter : public MCMachObjectTargetWriter {
   void RecordARMScatteredRelocation(MachObjectWriter *Writer,
                                     const MCAssembler &Asm,
                                     const MCAsmLayout &Layout,

llvm/lib/Target/ARM/MCTargetDesc/ARMWinCOFFStreamer.cpp

 //===-- ARMWinCOFFStreamer.cpp - ARM Target WinCOFF Streamer ----*- 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 "ARMMCTargetDesc.h"
-#include "Utils/ARMBaseInfo.h"
 #include "llvm/MC/MCAsmBackend.h"
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCCodeEmitter.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCObjectWriter.h"
 #include "llvm/MC/MCWin64EH.h"
 #include "llvm/MC/MCWinCOFFStreamer.h"