clang-format: Fix alignment of ObjC string literals.

This used to interfere with AlwaysBreakBeforeMultilineStrings.

This fixes llvm.org/PR17856.

llvm-svn: 194310
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index e37f0cd..d02fb34 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/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) {