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a25435bcf7
Make typeck a tcx method which calls typeck_root query Currently typeck query itself calls `tcx.typeck(tcx.typeck_root_def_id(key))` if its key isn't a type-check root. I thought this might be an overhead and made typeck a tcx method which calls typeck_root query instead. This is a step to simplify `cache_on_disk_if` query modifier. @petrochenkov please run perf