Fix variable debuginfo being optimized away at `mir-opt-level=2` #103657

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wesleywiser wants to merge 3 commits intorust-lang:masterfrom

wesleywiser:fix_mir_opt_away_var_debuginfo

Commits on Oct 27, 2022

Commits on Oct 28, 2022

Try turning on ConstDebugInfo pass
wesleywiser
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