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/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 580c949..d1cbdc8 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -24,6 +24,7 @@
 #include "clang/AST/Type.h"
 #include "clang/Parse/DeclSpec.h"
 #include "clang/Parse/Scope.h"
+#include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Basic/SourceManager.h"