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Auto merge of rust-lang#133321 - compiler-errors:const-checker, r=wesleywiser
Get rid of HIR const checker
As far as I can tell, the HIR const checker was implemented in rust-lang#66170 because we were not able to issue useful const error messages in the MIR const checker.
This seems to have changed in the last 5 years, probably due to work like rust-lang#90532. I've tweaked the diagnostics slightly and think the error messages have gotten *better* in fact.
Thus I think the HIR const checker has reached the end of its usefulness, and we can retire it.
cc `@RalfJung`
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