clang-format: Fix incorrect line break in certain configurations.

Before:
  void aaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
                          vector<int>
                              bbbbbbbbbbbbbbb);

After:
  void aaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
                          vector<int> bbbbbbbbbbbbbbb);

llvm-svn: 257257