Fix merging of << at end of input.

Commit of review http://reviews.llvm.org/D7766

llvm-svn: 230061
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 8dc7bb5..072c8af 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -9752,6 +9752,7 @@
 }
 
 TEST_F(FormatTest, MergeLessLessAtEnd) {
+  verifyFormat("<<");
   verifyFormat("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
                "aaallvm::outs() <<");
   verifyFormat("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"