Formatter: Don't insert a space before unary operators after selector names.

Before:
  [color getRed: &r green: &g blue: &b alpha: &a];

Now:
  [color getRed:&r green:&g blue:&b alpha:&a];



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172337 91177308-0d34-0410-b5e6-96231b3b80d8