clang-format: Fix assert triggering on carriage returns.

llvm-svn: 228288
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index b88bdb9..d2ec643 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -2495,6 +2495,10 @@
             "\\na : b);",
             format("const char * c = STRINGIFY(\n"
                    "\\na : b);"));
+
+  verifyFormat("a\r\\");
+  verifyFormat("a\v\\");
+  verifyFormat("a\f\\");
 }
 
 TEST_F(FormatTest, IndentsPPDirectiveInReducedSpace) {