More #include cleaning
 - Drop Diagnostic.h from DeclSpec.h, move utility Diag methods into
   implementation .cpp


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@54626 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index f68f82b..d49626c 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -21,6 +21,7 @@
 #include "clang/Parse/DeclSpec.h" 
 #include "clang/Lex/Preprocessor.h"
 #include "clang/Lex/LiteralSupport.h"
+#include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
 #include "llvm/ADT/OwningPtr.h"