cc-v1.9.0

Added

• pass AddressSanitizer on to the C compiler (#2045)
• add source root for stable external object names (#2034)
• emit rerun-if-env-changed for the compiler's own env vars (#2035)
• (env) read Cargo's variables from the env snapshot (#2028)
• collect compile commands into a compile_commands.json (#1990)

Fixed

• don't prefer clang for -Clinker-plugin-lto=no (#2046)
• keep the order of flag and flag_if_supported (#2044)
• correct "arbitary" typo in target parser comment (#2039)
• correct "stablised" typos in TODO comments (#2040)
• (msvc) pass objects to the archiver relative to the output directory (#2033)
• honor disabled linker-plugin LTO (#2024)
• apply RUSTC_WRAPPER to the cl.exe cc finds itself (#2022)

Other

• (parallel) poll on jobserver helper thread (#2021)
• (parallel) add jobserver polling for windows (#2020)
• Regenerate windows sys bindings (#2019)
• (parallel) add polling for process exit on windows (#2016)
• (parallel) poll for process exit on macOS/bsd (#2014)