[clang] Remove unused forward declarations (NFC)

clang/lib/AST/CXXABI.h

@@ -21,7 +21,6 @@ namespace clang {
 class ASTContext;
 class CXXConstructorDecl;
 class DeclaratorDecl;
-class Expr;
 class MangleContext;
 class MangleNumberingContext;
 class MemberPointerType;

clang/lib/AST/Interp/ByteCodeExprGen.h

@@ -28,8 +28,6 @@ namespace clang {
 class QualType;
 
 namespace interp {
-class Function;
-class State;
 
 template <class Emitter> class LocalScope;
 template <class Emitter> class RecordScope;

clang/lib/AST/Interp/ByteCodeStmtGen.h

@@ -25,11 +25,7 @@
 #include "llvm/ADT/Optional.h"
 
 namespace clang {
-class QualType;
-
 namespace interp {
-class Function;
-class State;
 
 template <class Emitter> class LoopScope;
 template <class Emitter> class SwitchScope;

clang/lib/AST/Interp/Context.h

@@ -23,7 +23,6 @@
 namespace clang {
 class ASTContext;
 class LangOptions;
-class Stmt;
 class FunctionDecl;
 class VarDecl;
 

clang/lib/AST/Interp/InterpBlock.h

@@ -25,10 +25,8 @@ namespace clang {
 namespace interp {
 class Block;
 class DeadBlock;
-class Context;
 class InterpState;
 class Pointer;
-class Function;
 enum PrimType : unsigned;
 
 /// A memory block, either on the stack or in the heap.

clang/lib/AST/Interp/Pointer.h

@@ -26,10 +26,7 @@ namespace clang {
 namespace interp {
 class Block;
 class DeadBlock;
-class Context;
-class InterpState;
 class Pointer;
-class Function;
 enum PrimType : unsigned;
 
 /// A pointer to a memory block, live or dead.

clang/lib/AST/Interp/Program.h

@@ -29,15 +29,12 @@ namespace clang {
 class RecordDecl;
 class Expr;
 class FunctionDecl;
-class Stmt;
 class StringLiteral;
 class VarDecl;
 
 namespace interp {
 class Context;
-class State;
 class Record;
-class Scope;
 
 /// The program contains and links the bytecode for all functions.
 class Program {

clang/lib/CodeGen/CGBlocks.h

@@ -26,14 +26,7 @@
 #include "clang/Basic/TargetInfo.h"
 
 namespace llvm {
-class Constant;
-class Function;
-class GlobalValue;
-class DataLayout;
-class FunctionType;
-class PointerType;
 class Value;
-class LLVMContext;
 }
 
 namespace clang {

clang/lib/CodeGen/CGCXXABI.h

@@ -31,7 +31,6 @@ class CXXConstructorDecl;
 class CXXDestructorDecl;
 class CXXMethodDecl;
 class CXXRecordDecl;
-class FieldDecl;
 class MangleContext;
 
 namespace CodeGen {

clang/lib/CodeGen/CGCall.h

@@ -26,17 +26,13 @@
 #include "ABIInfo.h"
 
 namespace llvm {
-class AttributeList;
-class Function;
 class Type;
 class Value;
 } // namespace llvm
 
 namespace clang {
-class ASTContext;
 class Decl;
 class FunctionDecl;
-class ObjCMethodDecl;
 class VarDecl;
 
 namespace CodeGen {

clang/lib/CodeGen/CGCleanup.h

@@ -23,7 +23,6 @@ namespace llvm {
 class BasicBlock;
 class Value;
 class ConstantInt;
-class AllocaInst;
 }
 
 namespace clang {

clang/lib/CodeGen/CGDebugInfo.h

@@ -40,7 +40,6 @@ class ClassTemplateSpecializationDecl;
 class GlobalDecl;
 class ModuleMap;
 class ObjCInterfaceDecl;
-class ObjCIvarDecl;
 class UsingDecl;
 class VarDecl;
 enum class DynamicInitKind : unsigned;

clang/lib/CodeGen/CGOpenMPRuntime.h

@@ -35,7 +35,6 @@ class ArrayType;
 class Constant;
 class FunctionType;
 class GlobalVariable;
-class StructType;
 class Type;
 class Value;
 class OpenMPIRBuilder;
@@ -48,7 +47,6 @@ class OMPExecutableDirective;
 class OMPLoopDirective;
 class VarDecl;
 class OMPDeclareReductionDecl;
-class IdentifierInfo;
 
 namespace CodeGen {
 class Address;

clang/lib/CodeGen/CodeGenFunction.h

@@ -46,7 +46,6 @@ namespace llvm {
 class BasicBlock;
 class LLVMContext;
 class MDNode;
-class Module;
 class SwitchInst;
 class Twine;
 class Value;
@@ -55,13 +54,11 @@ class CanonicalLoopInfo;
 
 namespace clang {
 class ASTContext;
-class BlockDecl;
 class CXXDestructorDecl;
 class CXXForRangeStmt;
 class CXXTryStmt;
 class Decl;
 class LabelDecl;
-class EnumConstantDecl;
 class FunctionDecl;
 class FunctionProtoType;
 class LabelStmt;
@@ -80,7 +77,6 @@ class ObjCAtSynchronizedStmt;
 class ObjCAutoreleasePoolStmt;
 class OMPUseDevicePtrClause;
 class OMPUseDeviceAddrClause;
-class ReturnsNonNullAttr;
 class SVETypeFlags;
 class OMPExecutableDirective;
 
@@ -92,12 +88,10 @@ namespace CodeGen {
 class CodeGenTypes;
 class CGCallee;
 class CGFunctionInfo;
-class CGRecordLayout;
 class CGBlockInfo;
 class CGCXXABI;
 class BlockByrefHelpers;
 class BlockByrefInfo;
-class BlockFlags;
 class BlockFieldFlags;
 class RegionCodeGenTy;
 class TargetCodeGenInfo;

clang/lib/CodeGen/CodeGenModule.h

@@ -46,7 +46,6 @@ class GlobalValue;
 class DataLayout;
 class FunctionType;
 class LLVMContext;
-class OpenMPIRBuilder;
 class IndexedInstrProfReader;
 }
 
@@ -55,17 +54,13 @@ class ASTContext;
 class AtomicType;
 class FunctionDecl;
 class IdentifierInfo;
-class ObjCMethodDecl;
 class ObjCImplementationDecl;
-class ObjCCategoryImplDecl;
-class ObjCProtocolDecl;
 class ObjCEncodeExpr;
 class BlockExpr;
 class CharUnits;
 class Decl;
 class Expr;
 class Stmt;
-class InitListExpr;
 class StringLiteral;
 class NamedDecl;
 class ValueDecl;
@@ -78,13 +73,10 @@ class AnnotateAttr;
 class CXXDestructorDecl;
 class Module;
 class CoverageSourceInfo;
-class TargetAttr;
 class InitSegAttr;
-struct ParsedTargetAttr;
 
 namespace CodeGen {
 
-class CallArgList;
 class CodeGenFunction;
 class CodeGenTBAA;
 class CGCXXABI;
@@ -93,8 +85,6 @@ class CGObjCRuntime;
 class CGOpenCLRuntime;
 class CGOpenMPRuntime;
 class CGCUDARuntime;
-class BlockFieldFlags;
-class FunctionArgList;
 class CoverageMappingModuleGen;
 class TargetCodeGenInfo;
 

clang/lib/CodeGen/CodeGenTBAA.h

@@ -29,7 +29,6 @@ namespace clang {
   class Type;
 
 namespace CodeGen {
-class CGRecordLayout;
 
 // TBAAAccessKind - A kind of TBAA memory access descriptor.
 enum class TBAAAccessKind : unsigned {

clang/lib/CodeGen/CodeGenTypes.h

@@ -31,14 +31,9 @@ namespace clang {
 class ASTContext;
 template <typename> class CanQual;
 class CXXConstructorDecl;
-class CXXDestructorDecl;
 class CXXMethodDecl;
 class CodeGenOptions;
-class FieldDecl;
 class FunctionProtoType;
-class ObjCInterfaceDecl;
-class ObjCIvarDecl;
-class PointerType;
 class QualType;
 class RecordDecl;
 class TagDecl;

clang/lib/CodeGen/MacroPPCallbacks.h

@@ -17,7 +17,6 @@
 
 namespace llvm {
 class DIMacroFile;
-class DIMacroNode;
 }
 namespace clang {
 class Preprocessor;

clang/lib/CodeGen/TargetInfo.h

@@ -38,7 +38,6 @@ class ABIInfo;
 class CallArgList;
 class CodeGenFunction;
 class CGBlockInfo;
-class CGFunctionInfo;
 
 /// TargetCodeGenInfo - This class organizes various target-specific
 /// codegeneration issues, like target-specific attributes, builtins and so

clang/lib/Format/TokenAnnotator.h

@@ -19,8 +19,6 @@
 #include "clang/Format/Format.h"
 
 namespace clang {
-class SourceManager;
-
 namespace format {
 
 enum LineType {

clang/lib/Interpreter/IncrementalParser.h

@@ -30,9 +30,6 @@ class LLVMContext;
 namespace clang {
 class ASTConsumer;
 class CompilerInstance;
-class CodeGenerator;
-class DeclGroupRef;
-class FrontendAction;
 class IncrementalAction;
 class Parser;
 

clang/lib/Serialization/ASTReaderInternals.h

@@ -30,7 +30,6 @@ class ASTReader;
 class FileEntry;
 struct HeaderFileInfo;
 class HeaderSearch;
-class IdentifierTable;
 class ObjCMethodDecl;
 
 namespace serialization {

clang/lib/StaticAnalyzer/Checkers/WebKit/ASTUtils.h

@@ -17,10 +17,6 @@
 #include <utility>
 
 namespace clang {
-class CXXRecordDecl;
-class CXXBaseSpecifier;
-class FunctionDecl;
-class CXXMethodDecl;
 class Expr;
 
 /// This function de-facto defines a set of transformations that we consider

clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.h

@@ -15,7 +15,6 @@ namespace clang {
 class CXXBaseSpecifier;
 class CXXMethodDecl;
 class CXXRecordDecl;
-class Expr;
 class FunctionDecl;
 class Type;
 

clang/lib/StaticAnalyzer/Frontend/ModelInjector.h

@@ -29,10 +29,7 @@
 namespace clang {
 
 class CompilerInstance;
-class ASTUnit;
-class ASTReader;
 class NamedDecl;
-class Module;
 
 namespace ento {
 class ModelInjector : public CodeInjector {