clang-format: Fix regression introduced by r291801.

Uncovered by polly tests.

Before:
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaa,
                                 {}, aaaaaaaaaaaaaaaaaaaaaaa);

After:
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaa, {},
                                 aaaaaaaaaaaaaaaaaaaaaaa);

llvm-svn: 291807
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 640d9bd..b402b5c 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -6822,6 +6822,8 @@
                "             {List1, List2,\n"
                "              List3});",
                getLLVMStyleWithColumns(35));
+  verifyFormat("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaa, {},\n"
+               "                               aaaaaaaaaaaaaaaaaaaaaaa);");
 }
 
 TEST_F(FormatTest, PullTrivialFunctionDefinitionsIntoSingleLine) {