move library-specific diagnostic headers into library private dirs.  Reduce
redundant #includes.  Patch by Anders Johnsen!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63271 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/clang.cpp b/Driver/clang.cpp
index fba2df1..f5bb058 100644
--- a/Driver/clang.cpp
+++ b/Driver/clang.cpp
@@ -29,6 +29,7 @@
 #include "clang/Driver/InitHeaderSearch.h"
 #include "clang/Driver/TextDiagnosticBuffer.h"
 #include "clang/Driver/TextDiagnosticPrinter.h"
+#include "clang/Driver/DriverDiagnostic.h"
 #include "clang/Analysis/PathDiagnostic.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/TranslationUnit.h"
@@ -40,7 +41,6 @@
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
-#include "clang/Basic/DiagnosticDriver.h"
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/StringExtras.h"