clang-format: Fix space in direct destructor calls.

Before:
  void F(int& i) { i. ~int(); }

After:
  void F(int& i) { i.~int(); }

Also, some cleanups.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220269 91177308-0d34-0410-b5e6-96231b3b80d8