Remove rustc_error_codes deps except in rustc_driver
#68353
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This was referenced Jan 19, 2020
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Remove dependencies on
rustc_error_codesin all crates except forrustc_driver.This has some benefits:
Adding a new error code when hacking on the compiler only requires rebuilding at most
rustc_error_codes,rustc_driver, and the reflexive & transitive closure of the crate where the new error code is being added and its reverse dependencies. This improves time-to-UI-tests (TTUT).Adding an error description to an error code only requires rebuilding
rustc_error_codesandrustc_driver. This should substantially improve TTUT.r? @petrochenkov
cc @rust-lang/wg-diagnostics