clang-format: Always allow break after leading annotations.

Before:
  DEPRECATED("Use NewClass::NewFunction instead.") int OldFunction(
  const string &parameter) {}

Could not be formatted at all, as clang-format would both require and
disallow the break before "int".

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@245846 91177308-0d34-0410-b5e6-96231b3b80d8