Auto merge of rust-lang#109507 - Amanieu:panic-oom-payload, r=davidtwco

Report allocation errors as panics

OOM is now reported as a panic but with a custom payload type (`AllocErrorPanicPayload`) which holds the layout that was passed to `handle_alloc_error`.

This should be review one commit at a time:
- The first commit adds `AllocErrorPanicPayload` and changes allocation errors to always be reported as panics.
- The second commit removes `#[alloc_error_handler]` and the `alloc_error_hook` API.

ACP: rust-lang/libs-team#192

Closes rust-lang#51540
Closes rust-lang#51245

Author: bors

crates/hir-def/src/builtin_attr.rs

@@ -381,10 +381,6 @@ pub const INERT_ATTRIBUTES: &[BuiltinAttribute] = &[
 
     rustc_attr!(rustc_allocator, Normal, template!(Word), WarnFollowing, IMPL_DETAIL),
     rustc_attr!(rustc_nounwind, Normal, template!(Word), WarnFollowing, IMPL_DETAIL),
-    gated!(
-        alloc_error_handler, Normal, template!(Word), WarnFollowing,
-        experimental!(alloc_error_handler)
-    ),
     gated!(
         default_lib_allocator, Normal, template!(Word), WarnFollowing, allocator_internals,
         experimental!(default_lib_allocator),