update vec-shrink-panik test to allow panic_no_unwind in landingpads

Author: erikdesjardins

src/test/codegen/vec-shrink-panik.rs

@@ -16,13 +16,32 @@ pub fn shrink_to_fit(vec: &mut Vec<u32>) {
 // CHECK-LABEL: @issue71861
 #[no_mangle]
 pub fn issue71861(vec: Vec<u32>) -> Box<[u32]> {
+    // CHECK-NOT: panic
+
+    // Call to panic_no_unwind in case of double-panic is expected,
+    // but other panics are not.
+    // CHECK: cleanup
+    // CHECK-NEXT: ; call core::panicking::panic_no_unwind
+    // CHECK-NEXT: panic_no_unwind
+
     // CHECK-NOT: panic
     vec.into_boxed_slice()
 }
 
 // CHECK-LABEL: @issue75636
 #[no_mangle]
 pub fn issue75636<'a>(iter: &[&'a str]) -> Box<[&'a str]> {
+    // CHECK-NOT: panic
+
+    // Call to panic_no_unwind in case of double-panic is expected,
+    // but other panics are not.
+    // CHECK: cleanup
+    // CHECK-NEXT: ; call core::panicking::panic_no_unwind
+    // CHECK-NEXT: panic_no_unwind
+
     // CHECK-NOT: panic
     iter.iter().copied().collect()
 }
+
+// CHECK: ; core::panicking::panic_no_unwind
+// CHECK: declare void @{{.*}}panic_no_unwind