thread state coordinator: replaced shortened type name Func suffix with Function.

ThreadIDFunc => ThreadIDFunction
LogFunc      => LogIDFunction

We try to avoid abbreviations/shortened names.  Adjusted function parameter names
as well to replace _func with _function.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@218773 91177308-0d34-0410-b5e6-96231b3b80d8