clang-format: Fix alignment of ObjC string literals.

This used to interfere with AlwaysBreakBeforeMultilineStrings.

This fixes llvm.org/PR17856.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194310 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index e37f0cd..d02fb34 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -3636,6 +3636,13 @@
                    "b\\\n"
                    "c\";",
                    Break));
+
+  // Exempt ObjC strings for now.
+  EXPECT_EQ("NSString *const kString = @\"aaaa\"\n"
+            "                           \"bbbb\";",
+            format("NSString *const kString = @\"aaaa\"\n"
+                   "\"bbbb\";",
+                   Break));
 }
 
 TEST_F(FormatTest, AlignsPipes) {