[LTO] Remove unused includes (NFC) (#141355)

These are identified by misc-include-cleaner.  I've filtered out those
that break builds.  Also, I'm staying away from llvm-config.h,
config.h, and Compiler.h, which likely cause platform- or
compiler-specific build failures.

Author: kazutakahirata

llvm/lib/LTO/LTO.cpp

@@ -41,7 +41,6 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/FileSystem.h"
-#include "llvm/Support/FileUtilities.h"
 #include "llvm/Support/JSON.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"

llvm/lib/LTO/LTOBackend.cpp

@@ -35,15 +35,13 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
-#include "llvm/Support/Program.h"
 #include "llvm/Support/ThreadPool.h"
 #include "llvm/Support/ToolOutputFile.h"
 #include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/TargetParser/SubtargetFeature.h"
 #include "llvm/Transforms/IPO/WholeProgramDevirt.h"
-#include "llvm/Transforms/Scalar/LoopPassManager.h"
 #include "llvm/Transforms/Utils/FunctionImportUtils.h"
 #include "llvm/Transforms/Utils/SplitModule.h"
 #include <optional>

llvm/lib/LTO/LTOCodeGenerator.cpp

@@ -15,14 +15,12 @@
 
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringExtras.h"
-#include "llvm/Analysis/Passes.h"
 #include "llvm/Analysis/TargetLibraryInfo.h"
 #include "llvm/Analysis/TargetTransformInfo.h"
 #include "llvm/Bitcode/BitcodeWriter.h"
 #include "llvm/CodeGen/CommandFlags.h"
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
 #include "llvm/Config/config.h"
-#include "llvm/IR/Constants.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/DebugInfo.h"
 #include "llvm/IR/DerivedTypes.h"
@@ -40,26 +38,21 @@
 #include "llvm/LTO/legacy/LTOModule.h"
 #include "llvm/LTO/legacy/UpdateCompilerUsed.h"
 #include "llvm/Linker/Linker.h"
-#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/MC/MCContext.h"
 #include "llvm/MC/TargetRegistry.h"
 #include "llvm/Remarks/HotnessThresholdParser.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Process.h"
 #include "llvm/Support/Signals.h"
-#include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/ToolOutputFile.h"
-#include "llvm/Support/YAMLTraits.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/TargetParser/Host.h"
 #include "llvm/TargetParser/SubtargetFeature.h"
 #include "llvm/Transforms/IPO.h"
 #include "llvm/Transforms/IPO/Internalize.h"
 #include "llvm/Transforms/IPO/WholeProgramDevirt.h"
-#include "llvm/Transforms/ObjCARC.h"
 #include "llvm/Transforms/Utils/ModuleUtils.h"
 #include <optional>
 #include <system_error>

llvm/lib/LTO/LTOModule.cpp

@@ -21,19 +21,15 @@
 #include "llvm/IR/Module.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCInst.h"
-#include "llvm/MC/MCParser/MCAsmParser.h"
 #include "llvm/MC/MCSection.h"
-#include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/MC/TargetRegistry.h"
 #include "llvm/Object/IRObjectFile.h"
 #include "llvm/Object/MachO.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/Path.h"
 #include "llvm/Support/SourceMgr.h"
-#include "llvm/Support/TargetSelect.h"
 #include "llvm/Target/TargetLoweringObjectFile.h"
 #include "llvm/TargetParser/Host.h"
 #include "llvm/TargetParser/SubtargetFeature.h"

llvm/lib/LTO/ThinLTOCodeGenerator.cpp

@@ -17,7 +17,6 @@
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringExtras.h"
-#include "llvm/Analysis/AliasAnalysis.h"
 #include "llvm/Analysis/ModuleSummaryAnalysis.h"
 #include "llvm/Analysis/ProfileSummaryInfo.h"
 #include "llvm/Analysis/TargetLibraryInfo.h"
@@ -58,11 +57,8 @@
 #include "llvm/Transforms/IPO/FunctionImport.h"
 #include "llvm/Transforms/IPO/Internalize.h"
 #include "llvm/Transforms/IPO/WholeProgramDevirt.h"
-#include "llvm/Transforms/ObjCARC.h"
 #include "llvm/Transforms/Utils/FunctionImportUtils.h"
 
-#include <numeric>
-
 #if !defined(_MSC_VER) && !defined(__MINGW32__)
 #include <unistd.h>
 #else