Add check-pass test for #[unwind(aborts)] on a const fn

Author: ecstatic-morse

src/test/ui/consts/unwind-abort.rs

@@ -0,0 +1,17 @@
+// check-pass
+
+#![feature(unwind_attributes, const_panic)]
+
+// `#[unwind(aborts)]` is okay for a `const fn`. We don't unwind in const-eval anyways.
+#[unwind(aborts)]
+const fn foo() {
+    panic!()
+}
+
+const fn bar() {
+    foo();
+}
+
+fn main() {
+    bar();
+}