[AArch64] Remove unused includes (NFC) (#141375)

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/Target/AArch64/AArch64Arm64ECCallLowering.cpp

@@ -26,7 +26,6 @@
 #include "llvm/IR/Instruction.h"
 #include "llvm/IR/Mangler.h"
 #include "llvm/IR/Module.h"
-#include "llvm/InitializePasses.h"
 #include "llvm/Object/COFF.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/CommandLine.h"

llvm/lib/Target/AArch64/AArch64InstrInfo.cpp

@@ -54,7 +54,6 @@
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
 #include <cassert>
-#include <cstddef>
 #include <cstdint>
 #include <iterator>
 #include <utility>

llvm/lib/Target/AArch64/Disassembler/AArch64ExternalSymbolizer.cpp

@@ -8,7 +8,6 @@
 
 #include "AArch64ExternalSymbolizer.h"
 #include "MCTargetDesc/AArch64MCExpr.h"
-#include "Utils/AArch64BaseInfo.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCInst.h"

llvm/lib/Target/AArch64/GISel/AArch64PostLegalizerLowering.cpp

@@ -43,7 +43,6 @@
 #include "llvm/CodeGen/TargetOpcodes.h"
 #include "llvm/CodeGen/TargetPassConfig.h"
 #include "llvm/IR/InstrTypes.h"
-#include "llvm/InitializePasses.h"
 #include "llvm/Support/ErrorHandling.h"
 #include <optional>
 

llvm/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.cpp

@@ -12,10 +12,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "AArch64MCExpr.h"
-#include "llvm/BinaryFormat/ELF.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCStreamer.h"
-#include "llvm/MC/MCSymbolELF.h"
 #include "llvm/MC/MCValue.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/ErrorHandling.h"

llvm/lib/Target/AArch64/SMEABIPass.cpp

@@ -20,7 +20,6 @@
 #include "llvm/IR/IntrinsicsAArch64.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
-#include "llvm/InitializePasses.h"
 #include "llvm/Transforms/Utils/Cloning.h"
 
 using namespace llvm;