Superficial fix for PR20218: binding a function lvalue to a const reference to

Superficial fix for PR20218: binding a function lvalue to a const reference to
a function pointer is neither better nor worse than binding a function lvalue
to a function rvalue reference. Don't get confused and think that both bindings
are binding to a function lvalue (which would make the lvalue form win); the
const reference is binding to an rvalue.

The "real" bug in PR20218 is still present: we're getting the wrong answer from
template argument deduction, and that's what leads us to this weird overload
set.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@212916 91177308-0d34-0410-b5e6-96231b3b80d8