Auto merge of #118824 - aliemjay:perf-region-cons, r=compiler-errors

use Vec for region constraints instead of BTreeMap

~1% perf gain

Diagnostic regressions need more investigation.

r? `@ghost`
This commit is contained in:
bors 2023-12-22 20:28:48 +00:00
commit 5677bc2c44

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