[Bitcode] Remove unused includes (NFC) (#141354)

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/Bitcode/Reader/BitcodeReader.cpp

@@ -83,7 +83,6 @@
 #include <map>
 #include <memory>
 #include <optional>
-#include <set>
 #include <string>
 #include <system_error>
 #include <tuple>

llvm/lib/Bitcode/Reader/MetadataLoader.cpp

@@ -21,7 +21,6 @@
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Twine.h"
-#include "llvm/ADT/ilist_iterator.h"
 #include "llvm/BinaryFormat/Dwarf.h"
 #include "llvm/Bitcode/BitcodeReader.h"
 #include "llvm/Bitcode/LLVMBitCodes.h"
@@ -44,7 +43,6 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/type_traits.h"
 
 #include <algorithm>
 #include <cassert>
@@ -57,7 +55,6 @@
 #include <optional>
 #include <string>
 #include <tuple>
-#include <type_traits>
 #include <utility>
 #include <vector>
 namespace llvm {

llvm/lib/Bitcode/Reader/ValueList.cpp

@@ -9,16 +9,12 @@
 #include "ValueList.h"
 #include "llvm/IR/Argument.h"
 #include "llvm/IR/Constant.h"
-#include "llvm/IR/Constants.h"
 #include "llvm/IR/GlobalValue.h"
 #include "llvm/IR/Instruction.h"
 #include "llvm/IR/Type.h"
-#include "llvm/IR/User.h"
 #include "llvm/IR/Value.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/Error.h"
-#include "llvm/Support/ErrorHandling.h"
-#include <cstddef>
 
 using namespace llvm;
 

llvm/lib/Bitcode/Writer/BitcodeWriter.cpp

@@ -61,7 +61,6 @@
 #include "llvm/MC/StringTableBuilder.h"
 #include "llvm/MC/TargetRegistry.h"
 #include "llvm/Object/IRSymtab.h"
-#include "llvm/ProfileData/IndexedMemProfData.h"
 #include "llvm/ProfileData/MemProf.h"
 #include "llvm/ProfileData/MemProfRadixTree.h"
 #include "llvm/Support/AtomicOrdering.h"