Phase 1 unwind failure when a Rust frame containing an aborting drop guard is called from code without unwinding info

[nbdd0121]

Spawn off from #109672

test.rs:

#[no_mangle]
extern "C" fn d() {
    struct Double;

    impl Drop for Double {
        fn drop(&mut self) {
            std::process::abort();
        }
    }

    let _d = Double;

    panic!("once");
}

test.c:

void d();

int main(void) {
    d();
}

compile with:

rustc -O test.rs --crate-type staticlib
gcc test.c libtest.a
./a.out

and I get:

thread '<unnamed>' panicked at 'once', test.rs:13:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
fatal runtime error: failed to initiate panic, error 5
Aborted

cc @rust-lang/wg-ffi-unwind @nikic
@rustbot label: +T-compiler