Move CXString creation/management routines into
their own .cpp file and make the interpretation
of its flags private.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@119319 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CXCursor.cpp b/tools/libclang/CXCursor.cpp
index f5941e7..a8cbca5 100644
--- a/tools/libclang/CXCursor.cpp
+++ b/tools/libclang/CXCursor.cpp
@@ -14,6 +14,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "CXCursor.h"
+#include "CXString.h"
 #include "clang/Frontend/ASTUnit.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclCXX.h"