clang-format: Don't wrap before the ] of a lambda introducer.

clang-format: Don't wrap before the ] of a lambda introducer.

Before:
  return aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa([=
  ](int iiiiiiiiiiii) {
    return aaaaaaaaaaaaaaaaaaaaaaa != aaaaaaaaaaaaaaaaaaaaaaa;
  });

After:
  return aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa([=](
      int iiiiiiiiiiii) {
    return aaaaaaaaaaaaaaaaaaaaaaa != aaaaaaaaaaaaaaaaaaaaaaa;
  });

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@241583 91177308-0d34-0410-b5e6-96231b3b80d8