update test for nounwind on FFI imports

Author: RalfJung

src/test/codegen/extern-functions.rs

@@ -0,0 +1,41 @@
+// compile-flags: -C no-prepopulate-passes
+
+#![crate_type = "lib"]
+#![feature(unwind_attributes)]
+
+extern {
+// CHECK: Function Attrs: nounwind
+// CHECK-NEXT: declare void @extern_fn
+    fn extern_fn();
+// CHECK-NOT: Function Attrs: nounwind
+// CHECK: declare void @unwinding_extern_fn
+    #[unwind(allowed)]
+    fn unwinding_extern_fn();
+// CHECK-NOT: nounwind
+// CHECK: declare void @aborting_extern_fn
+    #[unwind(aborts)]
+    fn aborting_extern_fn(); // FIXME: we want to have the attribute here
+}
+
+extern "Rust" {
+// CHECK-NOT: nounwind
+// CHECK: declare void @rust_extern_fn
+    fn rust_extern_fn();
+// CHECK-NOT: nounwind
+// CHECK: declare void @rust_unwinding_extern_fn
+    #[unwind(allowed)]
+    fn rust_unwinding_extern_fn();
+// CHECK-NOT: nounwind
+// CHECK: declare void @rust_aborting_extern_fn
+    #[unwind(aborts)]
+    fn rust_aborting_extern_fn(); // FIXME: we want to have the attribute here
+}
+
+pub unsafe fn force_declare() {
+    extern_fn();
+    unwinding_extern_fn();
+    aborting_extern_fn();
+    rust_extern_fn();
+    rust_unwinding_extern_fn();
+    rust_aborting_extern_fn();
+}