diff --git a/clang/lib/CodeGen/ABIInfo.h b/clang/lib/CodeGen/ABIInfo.h
--- a/clang/lib/CodeGen/ABIInfo.h
+++ b/clang/lib/CodeGen/ABIInfo.h
@@ -35,10 +35,6 @@
   class CodeGenTypes;
   class SwiftABIInfo;
 
-namespace swiftcall {
-  class SwiftAggLowering;
-}
-
   // FIXME: All of this stuff should be part of the target interface
   // somehow. It is currently here because it is not clear how to factor
   // the targets to support this, since the Targets currently live in a
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -10,6 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "ABIInfo.h"
 #include "CGCUDARuntime.h"
 #include "CGCXXABI.h"
 #include "CGObjCRuntime.h"
diff --git a/clang/lib/CodeGen/CGCall.h b/clang/lib/CodeGen/CGCall.h
--- a/clang/lib/CodeGen/CGCall.h
+++ b/clang/lib/CodeGen/CGCall.h
@@ -22,9 +22,6 @@
 #include "clang/AST/Type.h"
 #include "llvm/IR/Value.h"
 
-// FIXME: Restructure so we don't have to expose so much stuff.
-#include "ABIInfo.h"
-
 namespace llvm {
 class Type;
 class Value;
diff --git a/clang/lib/CodeGen/CGObjCRuntime.h b/clang/lib/CodeGen/CGObjCRuntime.h
--- a/clang/lib/CodeGen/CGObjCRuntime.h
+++ b/clang/lib/CodeGen/CGObjCRuntime.h
@@ -34,7 +34,8 @@
 
 namespace clang {
 namespace CodeGen {
-  class CodeGenFunction;
+class CGFunctionInfo;
+class CodeGenFunction;
 }
 
   class FieldDecl;
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -11,6 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "CodeGenModule.h"
+#include "ABIInfo.h"
 #include "CGBlocks.h"
 #include "CGCUDARuntime.h"
 #include "CGCXXABI.h"
@@ -32,7 +33,6 @@
 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/Mangle.h"
-#include "clang/AST/RecordLayout.h"
 #include "clang/AST/RecursiveASTVisitor.h"
 #include "clang/AST/StmtVisitor.h"
 #include "clang/Basic/Builtins.h"
diff --git a/clang/lib/CodeGen/SwiftCallingConv.cpp b/clang/lib/CodeGen/SwiftCallingConv.cpp
--- a/clang/lib/CodeGen/SwiftCallingConv.cpp
+++ b/clang/lib/CodeGen/SwiftCallingConv.cpp
@@ -11,9 +11,10 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/CodeGen/SwiftCallingConv.h"
-#include "clang/Basic/TargetInfo.h"
+#include "ABIInfo.h"
 #include "CodeGenModule.h"
 #include "TargetInfo.h"
+#include "clang/Basic/TargetInfo.h"
 
 using namespace clang;
 using namespace CodeGen;
diff --git a/clang/lib/CodeGen/TargetInfo.h b/clang/lib/CodeGen/TargetInfo.h
--- a/clang/lib/CodeGen/TargetInfo.h
+++ b/clang/lib/CodeGen/TargetInfo.h
@@ -43,10 +43,10 @@
 /// codegeneration issues, like target-specific attributes, builtins and so
 /// on.
 class TargetCodeGenInfo {
-  std::unique_ptr<ABIInfo> Info = nullptr;
+  std::unique_ptr<ABIInfo> Info;
 
 public:
-  TargetCodeGenInfo(std::unique_ptr<ABIInfo> Info) : Info(std::move(Info)) {}
+  TargetCodeGenInfo(std::unique_ptr<ABIInfo> Info);
   virtual ~TargetCodeGenInfo();
 
   /// getABIInfo() - Returns ABI info helper for the target.
diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -443,6 +443,9 @@
   return Address(PHI, Addr1.getElementType(), Align);
 }
 
+TargetCodeGenInfo::TargetCodeGenInfo(std::unique_ptr<ABIInfo> Info)
+    : Info(std::move(Info)) {}
+
 TargetCodeGenInfo::~TargetCodeGenInfo() = default;
 
 // If someone can figure out a general rule for this, that would be great.