swift234

Fix SR-599 - Function with unresolved generic diagnosed as property

There are two problems here, first we were diagnosing type member
constraints with the "function 'foo' was used as a property" error,
which doesn't make sense.

Second, we were diagnosing member constraints as lookup failures when
the constraint was actually referring to an archetype in its anchor
expression that wasn't resolved.  Address this by simply ignoring the
constraint and letting ambiguity resolution handle it.

Before:
t.swift:5:9: error: function 'foo' was used as a property; add () to call it

After:
t.swift:5:9: error: generic parameter 'T' could not be inferred
let a = foo()
t.swift:4:6: note: in call to function 'foo'
func foo<T: IntegerType>() -> T.Type { return T.self }

Thanks to Jordan for noticing this!