clang-format: Understand that breaking before lambdas is fine.

Before:
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa([](
      const aaaaaaaaaa &a) { return a; });

After:
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(
      [](const aaaaaaaaaa &a) { return a; });

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211575 91177308-0d34-0410-b5e6-96231b3b80d8