Auto merge of #115627 - compiler-errors:icedump-no-std, r=m-ou-se

Don't modify libstd to dump rustc ICEs

Do a much simpler thing and just dump a `std::backtrace::Backtrace` to file.

r? `@estebank` `@oli-obk`

Fixes #115610

library/std/src/lib.rs

@@ -637,9 +637,6 @@ pub mod alloc;
 // Private support modules
 mod panicking;
 
-#[unstable(feature = "ice_to_disk", issue = "none")]
-pub use panicking::panic_hook_with_disk_dump;
-
 #[path = "../../backtrace/src/lib.rs"]
 #[allow(dead_code, unused_attributes, fuzzy_provenance_casts)]
 mod backtrace_rs;