bors eab201df70 Auto merge of #86003 - pnkfelix:issue-84297-revert-81238, r=Mark-Simulacrum
Make copy/copy_nonoverlapping fn's again

Make copy/copy_nonoverlapping fn's again, rather than intrinsics.

This a short-term change to address issue #84297.

It effectively reverts PRs #81167 #81238 (and part of #82967), #83091, and parts of #79684.
2021-06-09 16:47:05 +00:00
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