[Basic] Remove unused includes (NFC) (#142295)

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

clang/lib/Basic/Attributes.cpp

@@ -18,7 +18,6 @@
 #include "clang/Basic/SimpleTypoCorrection.h"
 #include "clang/Basic/TargetInfo.h"
 
-#include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringSwitch.h"
 
 using namespace clang;

clang/lib/Basic/CodeGenOptions.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/Basic/CodeGenOptions.h"
-#include <string.h>
 
 namespace clang {
 

clang/lib/Basic/Cuda.cpp

@@ -1,6 +1,5 @@
 #include "clang/Basic/Cuda.h"
 
-#include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/VersionTuple.h"

clang/lib/Basic/Diagnostic.cpp

@@ -18,13 +18,11 @@
 #include "clang/Basic/DiagnosticIDs.h"
 #include "clang/Basic/DiagnosticOptions.h"
 #include "clang/Basic/IdentifierTable.h"
-#include "clang/Basic/PartialDiagnostic.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/Specifiers.h"
 #include "clang/Basic/TokenKinds.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
-#include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringMap.h"
@@ -42,7 +40,6 @@
 #include <cstddef>
 #include <cstdint>
 #include <cstring>
-#include <limits>
 #include <memory>
 #include <string>
 #include <utility>

clang/lib/Basic/DiagnosticIDs.cpp

@@ -20,7 +20,6 @@
 #include "llvm/ADT/StringTable.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/Path.h"
 #include <map>
 #include <optional>
 using namespace clang;

clang/lib/Basic/ExpressionTraits.cpp

@@ -11,7 +11,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/Basic/ExpressionTraits.h"
-#include "llvm/Support/ErrorHandling.h"
 #include <cassert>
 using namespace clang;
 

clang/lib/Basic/FileEntry.cpp

@@ -12,7 +12,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/Basic/FileEntry.h"
-#include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/VirtualFileSystem.h"
 
 using namespace clang;

clang/lib/Basic/FileManager.cpp

@@ -18,15 +18,13 @@
 
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/FileSystemStatCache.h"
-#include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Config/llvm-config.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/raw_ostream.h"
-#include <algorithm>
 #include <cassert>
 #include <climits>
 #include <cstdint>

clang/lib/Basic/FileSystemStatCache.cpp

@@ -11,7 +11,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/Basic/FileSystemStatCache.h"
-#include "llvm/Support/Chrono.h"
 #include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/VirtualFileSystem.h"

clang/lib/Basic/IdentifierTable.cpp

@@ -21,7 +21,6 @@
 #include "clang/Basic/TokenKinds.h"
 #include "llvm/ADT/DenseMapInfo.h"
 #include "llvm/ADT/FoldingSet.h"
-#include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Allocator.h"