rustc: Typecheck whiles and do-whiles. Add a workaround to complex.rs pending a solution to the one-armed-if problem.

rustc: As an experiment, swap the expected/actual types when checking function arguments. Produces better diagnostics for arg-type-mismatch.rs.

rustc: "Expected" and "actual" were swapped. Also un-XFAIL compile-fail/arg-count-mismatch.rs for good measure.

Check and translate 'as' cast-operator, lower target-specific types, reindent rustc.rs, enable uint test.