Fixing (or at least improving) translation of move semantics for send and receive. This let's us run all of the task-comm tests.

src/test/run-pass/task-comm-10.rs

@@ -23,11 +23,10 @@ fn main() {
 
     p = port();
     child = spawn start(chan(p));
+    auto c;
 
     p |> c;
     c <| "A";
     c <| "B";
     task::yield();
-
-    auto c;
 }

src/test/run-pass/task-comm-11.rs

@@ -1,6 +1,4 @@
 // xfail-stage0
-// xfail-stage1
-// xfail-stage2
 // xfail-stage3
 
 fn start(chan[chan[str]] c) {