defrost RUST_MIN_STACK=ice rustc hello.rs

An earlier commit included the change for a suggestion here.
Unfortunately, it also used unwrap instead of dying properly.
Roll out the ~~rice paper~~ EarlyDiagCtxt before we do anything that
might leave a mess.

compiler/rustc_interface/src/interface.rs

@@ -389,6 +389,7 @@ pub fn run_compiler<R: Send>(config: Config, f: impl FnOnce(&Compiler) -> R + Se
     let hash_kind = config.opts.unstable_opts.src_hash_algorithm(&target);
 
     util::run_in_thread_pool_with_globals(
+        &early_dcx,
         config.opts.edition,
         config.opts.unstable_opts.threads,
         SourceMapInputs { file_loader, path_mapping, hash_kind },