clang-format: Fix indentation relative to unary expressions.

This should be done, only if we are still in the unary expression's
scope.

Before:
  bool aaaa = !aaaaaaaa(  // break
                   aaaaaaaaaaa);
  *aaaaaa = aaaaaaa( // break
       aaaaaaaaaaaaaaaa);

After:
  bool aaaa = !aaaaaaaa(  // break
                   aaaaaaaaaaa); // <- (unchanged)
  *aaaaaa = aaaaaaa( // break
      aaaaaaaaaaaaaaaa); // <- (no longer indented relative to "*")

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189108 91177308-0d34-0410-b5e6-96231b3b80d8