clang-format: [Java] Fix breaking after annotations.

Before:
  @Annotation1 // comment
  @Annotation2 class C {}

After:
  @Annotation1 // comment
  @Annotation2
  class C {}

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@222825 91177308-0d34-0410-b5e6-96231b3b80d8