Move ChainedIncludesSource into the Frontend library. This never really
belonged in the Serialization library, it's setting up a compilation,
not just deserializing.

This should fix PR11512, making Serialization actually be layered below
Frontend, a long standing layering violation in Clang.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146233 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/FrontendAction.cpp b/lib/Frontend/FrontendAction.cpp
index b5284d8..439a124 100644
--- a/lib/Frontend/FrontendAction.cpp
+++ b/lib/Frontend/FrontendAction.cpp
@@ -14,6 +14,7 @@
 #include "clang/Lex/HeaderSearch.h"
 #include "clang/Lex/Preprocessor.h"
 #include "clang/Frontend/ASTUnit.h"
+#include "clang/Frontend/ChainedIncludesSource.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
 #include "clang/Frontend/FrontendPluginRegistry.h"
@@ -21,7 +22,6 @@
 #include "clang/Parse/ParseAST.h"
 #include "clang/Serialization/ASTDeserializationListener.h"
 #include "clang/Serialization/ASTReader.h"
-#include "clang/Serialization/ChainedIncludesSource.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Timer.h"
 #include "llvm/Support/ErrorHandling.h"