bless expect-region-supply-region-2 test under polonius

Polonius also emits the error that NLL doesn't get a chance to: see comment
"Borrowck doesn't get a chance to run, but if it did it should error here."

Author: lqd

src/test/ui/closures/closure-expected-type/expect-region-supply-region-2.polonius.stderr

@@ -0,0 +1,37 @@
+error: lifetime may not live long enough
+  --> $DIR/expect-region-supply-region-2.rs:14:30
+   |
+LL | fn expect_bound_supply_named<'x>() {
+   |                              -- lifetime `'x` defined here
+...
+LL |     closure_expecting_bound(|x: &'x u32| {
+   |                              ^  - let's call the lifetime of this reference `'1`
+   |                              |
+   |                              requires that `'1` must outlive `'x`
+
+error[E0521]: borrowed data escapes outside of closure
+  --> $DIR/expect-region-supply-region-2.rs:20:9
+   |
+LL |     let mut f: Option<&u32> = None;
+   |         ----- `f` declared here, outside of the closure body
+...
+LL |     closure_expecting_bound(|x: &'x u32| {
+   |                              - `x` is a reference that is only valid in the closure body
+...
+LL |         f = Some(x);
+   |         ^^^^^^^^^^^ `x` escapes the closure body here
+
+error: lifetime may not live long enough
+  --> $DIR/expect-region-supply-region-2.rs:14:30
+   |
+LL | fn expect_bound_supply_named<'x>() {
+   |                              -- lifetime `'x` defined here
+...
+LL |     closure_expecting_bound(|x: &'x u32| {
+   |                              ^ requires that `'x` must outlive `'static`
+   |
+   = help: consider replacing `'x` with `'static`
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0521`.