libclang: itroduce cxstring::createEmpty()


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174174 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CXLoadedDiagnostic.cpp b/tools/libclang/CXLoadedDiagnostic.cpp
index 65b816c..b9c4135 100644
--- a/tools/libclang/CXLoadedDiagnostic.cpp
+++ b/tools/libclang/CXLoadedDiagnostic.cpp
@@ -102,7 +102,7 @@
 
 CXString CXLoadedDiagnostic::getDiagnosticOption(CXString *Disable) const {
   if (DiagOption.empty())
-    return createCXString("");
+    return cxstring::createEmpty();
 
   // FIXME: possibly refactor with logic in CXStoredDiagnostic.
   if (Disable)
@@ -241,7 +241,7 @@
       if (error)
         *error = CXLoadDiag_None;
       if (errorString)
-        *errorString = createCXString("");
+        *errorString = cxstring::createEmpty();
     }
 
   CXDiagnosticSet load(const char *file);