Fix bug in trans_for, un-XFAIL linear-for-loop.rs.

src/Makefile

@@ -456,6 +456,7 @@ TEST_XFAILS_RUSTC := $(filter-out \
                         large-records.rs \
                         lazy-init.rs \
                         lazy-and-or.rs \
+                        linear-for-loop.rs \
                         multiline-comment.rs \
                         obj-drop.rs \
                         obj-recursion.rs \

src/comp/middle/trans.rs

@@ -1808,7 +1808,7 @@ fn trans_for(@block_ctxt cx,
         cx.build.Br(scope_cx.llbb);
         auto local_res = alloc_local(scope_cx, local);
         auto bcx = copy_ty(local_res.bcx, true, local_res.val, curr, t).bcx;
-        trans_block(bcx, body);
+        bcx = trans_block(bcx, body).bcx;
         bcx.build.Br(next_cx.llbb);
         ret res(next_cx, C_nil());
     }