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087ae978a1
[perf] cache type info for ParamEnv This is an attempt to mitigate some of the perf regressions in https://github.com/rust-lang/rust/pull/122553#issuecomment-2007563027, but seems worth to test and land separately, since it is mostly unrelated to that PR.
For more information about how rustc works, see the rustc dev guide.