Commits on Oct 31, 2022

1. Rewrite implementation of #[alloc_error_handler] …

   The new implementation doesn't use weak lang items and instead changes
   `#[alloc_error_handler]` to an attribute macro just like
   `#[global_allocator]`.
   
   The attribute will generate the `__rg_oom` function which is called by
   the compiler-generated `__rust_alloc_error_handler`. If no `__rg_oom`
   function is defined in any crate then the compiler shim will call
   `__rdl_oom` in the alloc crate which will simply panic.
   
   This also fixes link errors with `-C link-dead-code` with
   `default_alloc_error_handler`: `__rg_oom` was previously defined in the
   alloc crate and would attempt to reference the `oom` lang item, even if
   it didn't exist. This worked as long as `__rg_oom` was excluded from
   linking since it was not called.
   
   This is a prerequisite for the stabilization of
   `default_alloc_error_handler` (rust-lang#102318).

   

   Amanieu committed Oct 31, 2022
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