[DO NOT MERGE] `-Zthir-unsafeck` perf#87710

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LeSeulArtichaut wants to merge 1 commit intorust-lang:masterfrom LeSeulArtichaut:thir-unsafeck-perf

+1-1

Commits on Aug 24, 2021

Enable -Zthir-unsafeck by default
LeSeulArtichaut
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