Create a new Serialization module that contains all the PCH code, and will contain all the module code in the future. Update the Makefiles, CMake projects and the Xcode project. I hope I did everything right for Xcode. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@111258 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/ASTUnit.cpp b/lib/Frontend/ASTUnit.cpp
index 428647f..019d25c 100644
--- a/lib/Frontend/ASTUnit.cpp
+++ b/lib/Frontend/ASTUnit.cpp
@@ -12,7 +12,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/Frontend/ASTUnit.h"
-#include "clang/Frontend/PCHWriter.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/ASTConsumer.h"
 #include "clang/AST/DeclVisitor.h"
@@ -26,7 +25,8 @@
 #include "clang/Frontend/FrontendActions.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
 #include "clang/Frontend/FrontendOptions.h"
-#include "clang/Frontend/PCHReader.h"
+#include "clang/Serialization/PCHReader.h"
+#include "clang/Serialization/PCHWriter.h"
 #include "clang/Lex/HeaderSearch.h"
 #include "clang/Lex/Preprocessor.h"
 #include "clang/Basic/TargetOptions.h"