Rollup merge of #159974 - panstromek:update-thin-vec, r=mejrs Update thinvec to 0.2.19 It contains `may_dangle` Drop impl under a feature flag. This allows us to use it in a lot more places, notable in types that hold `&'tcx` references. This would previously fail in borrowck in arena code. We have to enable its "unstable" feature for this. That also enables `TrustedLen` impl, which is behind unstable flag, too. I left the flag disabled, because it regressed next-solver benchmarks, but that will be fixed in PR that needs this flag (see the comment: https://github.com/rust-lang/rust/pull/159974#issuecomment-5091132427)
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