NFC: Remove ClangModuleLoader.h include from ExtInfo.h

This was unnecessarily pulling in a whole bunch
of Clang headers when all was needed was a
forward declaration.

Author: hamishknight

include/swift/AST/ASTContext.h

@@ -92,11 +92,13 @@ namespace swift {
   class LazyIterableDeclContextData;
   class LazyMemberLoader;
   struct MacroDiscriminatorContext;
+  class ModuleInterfaceChecker;
   class PatternBindingDecl;
   class PatternBindingInitializer;
   class PluginLoader;
   class SourceFile;
   class SourceLoc;
+  struct TemplateInstantiationError;
   class Type;
   class TypeVariableType;
   class TupleType;

include/swift/AST/ASTMangler.h

@@ -22,6 +22,7 @@
 
 namespace clang {
 class NamedDecl;
+class TypedefType;
 }
 
 namespace swift {

include/swift/AST/ASTPrinter.h

@@ -18,6 +18,7 @@
 #include "swift/Basic/UUID.h"
 #include "swift/AST/Identifier.h"
 #include "swift/AST/Decl.h"
+#include "clang/AST/Decl.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/DenseSet.h"
@@ -28,10 +29,6 @@
 // ambiguities with type names, in AliasModuleNames mode.
 #define MODULE_DISAMBIGUATING_PREFIX "Module___"
 
-namespace clang {
-class Decl;
-}
-
 namespace swift {
   class Decl;
   class DeclContext;

include/swift/AST/Decl.h

@@ -28,6 +28,7 @@
 #include "swift/AST/FreestandingMacroExpansion.h"
 #include "swift/AST/GenericParamKey.h"
 #include "swift/AST/IfConfigClause.h"
+#include "swift/AST/Import.h"
 #include "swift/AST/LayoutConstraint.h"
 #include "swift/AST/LifetimeAnnotation.h"
 #include "swift/AST/ReferenceCounting.h"
@@ -42,14 +43,20 @@
 #include "swift/Basic/Debug.h"
 #include "swift/Basic/InlineBitfield.h"
 #include "swift/Basic/Located.h"
+#include "swift/Basic/Nullability.h"
 #include "swift/Basic/NullablePtr.h"
 #include "swift/Basic/OptionalEnum.h"
 #include "swift/Basic/Range.h"
 #include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/TinyPtrVector.h"
 #include "llvm/Support/TrailingObjects.h"
 #include <map>
 #include <type_traits>
 
+namespace clang {
+class PointerAuthQualifier;
+} // end namespace clang
+
 namespace swift {
   enum class AccessSemantics : unsigned char;
   class AccessorDecl;

include/swift/AST/ExtInfo.h

@@ -21,7 +21,6 @@
 #define SWIFT_EXTINFO_H
 
 #include "swift/AST/AutoDiff.h"
-#include "swift/AST/ClangModuleLoader.h"
 
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/Optional.h"
@@ -38,6 +37,7 @@ namespace swift {
 class AnyFunctionType;
 class ASTExtInfo;
 class ASTExtInfoBuilder;
+class ClangModuleLoader;
 class FunctionType;
 class SILExtInfo;
 class SILExtInfoBuilder;

include/swift/AST/PropertyWrappers.h

@@ -28,6 +28,8 @@ class CustomAttr;
 class Expr;
 class VarDecl;
 class OpaqueValueExpr;
+class PropertyWrapperValuePlaceholderExpr;
+class SubscriptDecl;
 
 /// The kind of property initializer to look for
 enum class PropertyWrapperInitKind {

include/swift/AST/Types.h

@@ -37,6 +37,7 @@
 #include "swift/Basic/UUID.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMapInfo.h"
+#include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/FoldingSet.h"
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/Optional.h"

include/swift/SIL/TypeLowering.h

@@ -23,6 +23,7 @@
 #include "swift/SIL/SILValue.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/Hashing.h"
+#include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/Allocator.h"
 

include/swift/SILOptimizer/Utils/InstructionDeleter.h

@@ -97,6 +97,7 @@
 
 #include "swift/SIL/SILInstruction.h"
 #include "swift/SILOptimizer/Utils/InstModCallbacks.h"
+#include "llvm/ADT/SetVector.h"
 
 namespace swift {
 

include/swift/Sema/CSBindings.h

@@ -39,6 +39,7 @@
 namespace swift {
 
 class DeclContext;
+enum class KnownProtocolKind : uint8_t;
 class ProtocolDecl;
 
 namespace constraints {