[libclang] Introduce clang_Range_isNull.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140706 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index 7371817..a812631 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -2758,6 +2758,11 @@
       && range1.begin_int_data == range2.begin_int_data
       && range1.end_int_data == range2.end_int_data;
 }
+
+int clang_Range_isNull(CXSourceRange range) {
+  return clang_equalRanges(range, clang_getNullRange());
+}
+
 } // end: extern "C"
 
 static void createNullLocation(CXFile *file, unsigned *line,