message: rename rustc_allocator_nounwind to rustc_nounwind
diff: //@revisions: extern_block definition both
  #![feature(rustc_attrs, c_unwind)]
  -#[cfg_attr(any(definition, both), rustc_allocator_nounwind)]
  +#[cfg_attr(any(definition, both), rustc_nounwind)]
  #[no_mangle]
  extern "C-unwind" fn nounwind() {
  //[definition]~^ ERROR: abnormal termination: the program aborted execution
  @@ -11,7 +11,7 @@ extern "C-unwind" fn nounwind() {
  fn main() {
  extern "C-unwind" {
  - #[cfg_attr(any(extern_block, both), rustc_allocator_nounwind)]
  + #[cfg_attr(any(extern_block, both), rustc_nounwind)]
  fn nounwind();
  }
  unsafe { nounwind() }
  