resolve: Catch "cannot reexport" errors from macros 2.0 better

[petrochenkov]

After the macro 2.0 related holes are closed we can report span_delayed_bugs in more situations.

Merging #155945 would make changes in this PR simpler, but that PR will probably have to wait for quite some time.

This is a continuation of my import & privacy invariant hardening changes from #155257, #155213, #154149, etc.

r? @mu001999

[rust-log-analyzer]

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Build completed successfully in 0:00:00
##[group]Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.04s
##[endgroup]
skipping rustc download with `download-rustc = 'if-unchanged'` due to local changes
##[group]Checking stage1 compiler artifacts{rustc-main, rustc_abi, rustc_arena, rustc_ast, rustc_ast_ir, rustc_ast_lowering, rustc_ast_passes, rustc_ast_pretty, rustc_attr_parsing, rustc_baked_icu_data, rustc_borrowck, rustc_builtin_macros, rustc_codegen_llvm, rustc_codegen_ssa, rustc_const_eval, rustc_data_structures, rustc_driver, rustc_driver_impl, rustc_error_codes, rustc_error_messages, rustc_errors, rustc_expand, rustc_feature, rustc_fs_util, rustc_graphviz, rustc_hashes, rustc_hir, rustc_hir_analysis, rustc_hir_id, rustc_hir_pretty, rustc_hir_typeck, rustc_incremental, rustc_index, rustc_index_macros, rustc_infer, rustc_interface, rustc_lexer, rustc_lint, rustc_lint_defs, rustc_llvm, rustc_log, rustc_macros, rustc_metadata, rustc_middle, rustc_mir_build, rustc_mir_dataflow, rustc_mir_transform, rustc_monomorphize, rustc_next_trait_solver, rustc_parse, rustc_parse_format, rustc_passes, rustc_pattern_analysis, rustc_privacy, rustc_proc_macro, rustc_public, rustc_public_bridge, rustc_query_impl, rustc_resolve, rustc_sanitizers, rustc_serialize, rustc_session, rustc_span, rustc_symbol_mangling, rustc_target, rustc_thread_pool, rustc_trait_selection, rustc_traits, rustc_transmute, rustc_ty_utils, rustc_type_ir, rustc_type_ir_macros, rustc_windows_rc} (stage0 -> stage1, x86_64-unknown-linux-gnu)
##[endgroup]
##[group]Checking stage1 compiler artifacts (stage0 -> stage1, x86_64-unknown-linux-gnu)
##[endgroup]
##[group]Checking stage1 rustdoc (stage0 -> stage1, x86_64-unknown-linux-gnu)
---
   |         ^^^^^^^^^^^^^^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #127909 <https://github.com/rust-lang/rust/issues/127909>
   = note: `#[deny(pub_use_of_private_extern_crate)]` (part of `#[deny(future_incompatible)]`) on by default
help: consider making the `extern crate` item publicly accessible
   |
18 | pub extern crate ra_ap_rustc_abi as rustc_abi;
   | +++

[RUSTC-TIMING] macros test:false 0.944