Auto merge of #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: https://github.com/rust-lang/libs-team/issues/192

Closes #51540
Closes #51245

compiler/rustc_feature/src/active.rs

@@ -291,8 +291,6 @@ declare_features! (
     (active, abi_x86_interrupt, "1.17.0", Some(40180), None),
     /// Allows additional const parameter types, such as `&'static str` or user defined types
     (incomplete, adt_const_params, "1.56.0", Some(95174), None),
-    /// Allows defining an `#[alloc_error_handler]`.
-    (active, alloc_error_handler, "1.29.0", Some(51540), None),
     /// Allows trait methods with arbitrary self types.
     (active, arbitrary_self_types, "1.23.0", Some(44874), None),
     /// Allows using `const` operands in inline assembly.

compiler/rustc_feature/src/removed.rs

@@ -47,6 +47,8 @@ declare_features! (
 
     (removed, advanced_slice_patterns, "1.0.0", Some(62254), None,
      Some("merged into `#![feature(slice_patterns)]`")),
+    /// Allows defining an `#[alloc_error_handler]`.
+    (removed, alloc_error_handler, "CURRENT_RUSTC_VERSION", Some(51540), None, Some("now handled by panic handler")),
     (removed, allocator, "1.0.0", None, None, None),
     /// Allows a test to fail without failing the whole suite.
     (removed, allow_fail, "1.19.0", Some(46488), None, Some("removed due to no clear use cases")),