Test fixes from the rollup
Closes #15690 (Guide: improve error handling) Closes #15729 (Guide: guessing game) Closes #15751 (repair macro docs) Closes #15766 (rustc: Print a smaller hash on -v) Closes #15815 (Add unit test for rlibc) Closes #15820 (Minor refactoring and features in rustc driver for embedders) Closes #15822 (rustdoc: Add an --extern flag analagous to rustc's) Closes #15824 (Document Deque trait and bitv.) Closes #15832 (syntax: Join consecutive string literals in format strings together) Closes #15837 (Update LLVM to include NullCheckElimination pass) Closes #15841 (Rename to_str to to_string) Closes #15847 (Purge #[!resolve_unexported] from the compiler) Closes #15848 (privacy: Add publically-reexported foreign item to exported item set) Closes #15849 (fix string in from_utf8_lossy_100_multibyte benchmark) Closes #15850 (Get rid of few warnings in tests) Closes #15852 (Clarify the std::vec::Vec::with_capacity docs)
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