add cfg_panic bootstrap

Author: chiw-goog

library/core/tests/array.rs

@@ -392,6 +392,7 @@ fn array_try_from_fn() {
     assert_eq!(another_array, Err(SomeError::Foo));
 }
 
+#[cfg(not(panic = "abort"))]
 #[test]
 fn array_try_from_fn_drops_inserted_elements_on_err() {
     static DROP_COUNTER: AtomicUsize = AtomicUsize::new(0);
@@ -415,6 +416,7 @@ fn array_try_from_fn_drops_inserted_elements_on_err() {
     assert_eq!(DROP_COUNTER.load(Ordering::SeqCst), 2);
 }
 
+#[cfg(not(panic = "abort"))]
 #[test]
 fn array_try_from_fn_drops_inserted_elements_on_panic() {
     static DROP_COUNTER: AtomicUsize = AtomicUsize::new(0);
@@ -438,6 +440,7 @@ fn array_try_from_fn_drops_inserted_elements_on_panic() {
     assert_eq!(DROP_COUNTER.load(Ordering::SeqCst), 2);
 }
 
+#[cfg(not(panic = "abort"))]
 // https://stackoverflow.com/a/59211505
 fn catch_unwind_silent<F, R>(f: F) -> std::thread::Result<R>
 where

library/core/tests/iter/adapters/zip.rs

@@ -233,6 +233,7 @@ fn test_zip_trusted_random_access_composition() {
 }
 
 #[test]
+#[cfg(panic = "unwind")]
 fn test_zip_trusted_random_access_next_back_drop() {
     use std::panic::catch_unwind;
     use std::panic::AssertUnwindSafe;

library/core/tests/mem.rs

@@ -1,5 +1,6 @@
 use core::mem::*;
 
+#[cfg(panic = "unwind")]
 use std::rc::Rc;
 
 #[test]
@@ -189,6 +190,7 @@ fn uninit_write_slice_cloned_panic_gt() {
 }
 
 #[test]
+#[cfg(panic = "unwind")]
 fn uninit_write_slice_cloned_mid_panic() {
     use std::panic;