clang-format: Fix bug introduced in r198871.

We cannot simply change the start column to accomodate for the @ in an
ObjC string literal as that will make clang-format happily violate the
column limit.

Use a different workaround instead. However, a better long-term
solution might be to join the @ and the rest of the literal into a
single token.

llvm-svn: 199198
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 08a7776..33cc7eb 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -6266,7 +6266,7 @@
             format("L\"wide string literal\";", getGoogleStyleWithColumns(16)));
   EXPECT_EQ("@\"NSString \"\n"
             "@\"literal\";",
-            format("@\"NSString literal\";", getGoogleStyleWithColumns(16)));
+            format("@\"NSString literal\";", getGoogleStyleWithColumns(19)));
 }
 
 TEST_F(FormatTest, BreaksRawStringLiterals) {