swift234

Port test/expressions.swift over to the new type checker.

Strengthen TypeChecker::isLiteralCompatibleType() a bit to deal with
the ill-formed code here. It's throwaway code, since we'll be
switching to formal protocols anyway at some point.

There are some bugs regarding explicit lvalues in the new type
checker, filed as <rdar://problem/13989081> and <rdar://problem/13989094>.


Swift SVN r5332