[NFC] Remove unneeded header includes

[void]

Summary

Use forward decls instead of #including the header files.

clang/include/clang/AST/ASTContext.h

 #include "clang/AST/CommentCommandTraits.h"
 #include "clang/AST/ComparisonCategories.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclarationName.h"
 #include "clang/AST/ExternalASTSource.h"
 #include "clang/AST/PrettyPrinter.h"
 #include "clang/AST/RawCommentList.h"
 #include "clang/AST/TemplateName.h"
-#include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LLVM.h"
-#include "clang/Basic/LangOptions.h"
-#include "clang/Basic/NoSanitizeList.h"
 #include "clang/Basic/PartialDiagnostic.h"
-#include "clang/Basic/ProfileList.h"
 #include "clang/Basic/SourceLocation.h"
-#include "clang/Basic/XRayLists.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/FoldingSet.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
 #include "llvm/ADT/MapVector.h"
 #include "llvm/ADT/PointerIntPair.h"
 #include "llvm/ADT/PointerUnion.h"
 #include "llvm/ADT/SmallVector.h"

 
 namespace clang {
 
 class APValue;
 class ASTMutationListener;
 class ASTRecordLayout;
 class AtomicExpr;
 class BlockExpr;
+struct BlockVarCopyInit;
 class BuiltinTemplateDecl;
 class CharUnits;
 class ConceptDecl;
 class CXXABI;
 class CXXConstructorDecl;
 class CXXMethodDecl;
 class CXXRecordDecl;
 class DiagnosticsEngine;
-class ParentMapContext;
 class DynTypedNodeList;
 class Expr;
 enum class FloatModeKind;
 class GlobalDecl;
+class IdentifierTable;
+class LangOptions;
 class MangleContext;
 class MangleNumberingContext;
 class MemberSpecializationInfo;
 class Module;
 struct MSGuidDeclParts;
 class NestedNameSpecifier;
+class NoSanitizeList;
 class ObjCCategoryDecl;
 class ObjCCategoryImplDecl;
 class ObjCContainerDecl;
 class ObjCImplDecl;
 class ObjCImplementationDecl;
 class ObjCInterfaceDecl;
 class ObjCIvarDecl;
 class ObjCMethodDecl;
 class ObjCPropertyDecl;
 class ObjCPropertyImplDecl;
 class ObjCProtocolDecl;
 class ObjCTypeParamDecl;
 class OMPTraitInfo;
+class ParentMapContext;
 struct ParsedTargetAttr;
 class Preprocessor;
+class ProfileList;
 class StoredDeclsMap;
 class TargetAttr;
 class TargetInfo;
 class TemplateDecl;
 class TemplateParameterList;
 class TemplateTemplateParmDecl;
 class TemplateTypeParmDecl;
 class TypeConstraint;
 class UnresolvedSetIterator;
 class UsingShadowDecl;
 class VarTemplateDecl;
 class VTableContextBase;
-struct BlockVarCopyInit;
+class XRayFunctionFilter;
 
 namespace Builtin {
 
 class Context;
 
 } // namespace Builtin
 
 enum BuiltinTemplateKind : int;

clang/lib/AST/ASTContext.cpp

 #include "clang/Basic/ExceptionSpecificationType.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/Linkage.h"
 #include "clang/Basic/Module.h"
 #include "clang/Basic/NoSanitizeList.h"
 #include "clang/Basic/ObjCRuntime.h"
+#include "clang/Basic/ProfileList.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/Specifiers.h"
 #include "clang/Basic/TargetCXXABI.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Basic/XRayLists.h"
 #include "llvm/ADT/APFixedPoint.h"
 #include "llvm/ADT/APInt.h"

clang/lib/CodeGen/CodeGenModule.h

 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/DeclOpenMP.h"
 #include "clang/AST/GlobalDecl.h"
 #include "clang/AST/Mangle.h"
 #include "clang/Basic/ABI.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/Module.h"
 #include "clang/Basic/NoSanitizeList.h"
+#include "clang/Basic/ProfileList.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Basic/XRayLists.h"
 #include "clang/Lex/PreprocessorOptions.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/MapVector.h"
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/StringMap.h"