Have Range::overlapsWith use positive logic

Improved test to catch missing case.

llvm-svn: 188304
diff --git a/clang/unittests/Tooling/RefactoringTest.cpp b/clang/unittests/Tooling/RefactoringTest.cpp
index 81f9f04..a88de1c 100644
--- a/clang/unittests/Tooling/RefactoringTest.cpp
+++ b/clang/unittests/Tooling/RefactoringTest.cpp
@@ -353,6 +353,7 @@
   EXPECT_FALSE(Range(10, 10).overlapsWith(Range(0, 10)));
   EXPECT_FALSE(Range(0, 10).overlapsWith(Range(10, 10)));
   EXPECT_TRUE(Range(0, 10).overlapsWith(Range(2, 6)));
+  EXPECT_TRUE(Range(2, 6).overlapsWith(Range(0, 10)));
 }
 
 TEST(Range, contains) {