Rollup merge of #110233 - nbdd0121:intrinsic, r=tmiasko

Make rust-intrinsic ABI unwindable

Fix #104451, fix https://github.com/rust-lang/miri/issues/2839

r? `@RalfJung`

library/core/src/ffi/mod.rs

@@ -615,12 +615,15 @@ impl<'f> Drop for VaListImpl<'f> {
 extern "rust-intrinsic" {
     /// Destroy the arglist `ap` after initialization with `va_start` or
     /// `va_copy`.
+    #[rustc_nounwind]
     fn va_end(ap: &mut VaListImpl<'_>);
 
     /// Copies the current location of arglist `src` to the arglist `dst`.
+    #[rustc_nounwind]
     fn va_copy<'f>(dest: *mut VaListImpl<'f>, src: &VaListImpl<'f>);
 
     /// Loads an argument of type `T` from the `va_list` `ap` and increment the
     /// argument `ap` points to.
+    #[rustc_nounwind]
     fn va_arg<T: sealed_trait::VaArgSafe>(ap: &mut VaListImpl<'_>) -> T;
 }

library/core/src/ptr/mod.rs

@@ -1371,6 +1371,7 @@ pub const unsafe fn write<T>(dst: *mut T, src: T) {
     // as `intrinsics::copy_nonoverlapping` is a wrapper function.
     extern "rust-intrinsic" {
         #[rustc_const_stable(feature = "const_intrinsic_copy", since = "1.63.0")]
+        #[rustc_nounwind]
         fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: usize);
     }