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Some `is_useful` cleanups - #99843

Merged

bors merged 3 commits into

rust-lang:masterfrom

oli-obk:is_useful_perf

Aug 4, 2022

Commits on Jul 28, 2022
- Move constructor into the branch that actually uses it
  oli-obk
  committed
  970ff3d
- Don't pass (the rather large) `PatCtxt` by value
  oli-obk
  committed
  544de44
- Pass PatCtxt instead of passing MatchCtxt + Ty separately
  oli-obk
  committed
  803d374