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

llvm-svn: 54627
diff --git a/clang/lib/CodeGen/CGObjCRuntime.h b/clang/lib/CodeGen/CGObjCRuntime.h
index 109d274..c03857f 100644
--- a/clang/lib/CodeGen/CGObjCRuntime.h
+++ b/clang/lib/CodeGen/CGObjCRuntime.h
@@ -15,6 +15,7 @@
 
 #ifndef CLANG_CODEGEN_OBCJRUNTIME_H
 #define CLANG_CODEGEN_OBCJRUNTIME_H
+#include "clang/Basic/IdentifierTable.h" // Selector
 #include "llvm/ADT/SmallVector.h"
 #include <string>