swift234

Rewrite the function-call infrastructure.  This gets us
a lot closer to successfully emitting the polymorphic-min-over-ranges
example;  the main blocker right now seems to be that the witness
for a static member function is not, in fact, a static member
function at al, but a freestanding function.  That's legitimate,
but it probably needs some shepherding through the witness
system.

Swift SVN r2532