Make CXCursor's data opaque.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@93561 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang-c/Index.h b/include/clang-c/Index.h
index f11a9eb..79ec0f8 100644
--- a/include/clang-c/Index.h
+++ b/include/clang-c/Index.h
@@ -137,9 +137,7 @@
 
 typedef struct {
   enum CXCursorKind kind;
-  CXDecl decl;
-  CXStmt stmt; /* expression reference */
-  CXDecl referringDecl;
+  void *data[3];
 } CXCursor;  
 
 /* A unique token for looking up "visible" CXDecls from a CXTranslationUnit. */