More #include cleaning
 - Drop Expr.h,RecordLayout.h from ASTContext.h (for DeclBase.h and
   SourceLocation.h)
 - Move ASTContext constructor into implementation


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@54627 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/clang.cpp b/Driver/clang.cpp
index f35e318..05befe0 100644
--- a/Driver/clang.cpp
+++ b/Driver/clang.cpp
@@ -28,6 +28,7 @@
 #include "clang/Driver/TextDiagnosticBuffer.h"
 #include "clang/Driver/TextDiagnosticPrinter.h"
 #include "clang/Analysis/PathDiagnostic.h"
+#include "clang/AST/Decl.h"
 #include "clang/AST/TranslationUnit.h"
 #include "clang/CodeGen/ModuleBuilder.h"
 #include "clang/Sema/ParseAST.h"