Joshua Nelson 3c9765cff1 Rename debugging_opts to unstable_opts
This is no longer used only for debugging options (e.g. `-Zoutput-width`, `-Zallow-features`).
Rename it to be more clear.
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..
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2021-03-30 18:09:59 +02:00
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For info on how the incremental compilation works, see the rustc dev guide.