Backport "Fix problems with cycle checks" to LTS #20833
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Several improvements: - Follow opaque aliases as if they were aliases. Otherwise we risk crashing in phases where the `opaque` is dropped and these become regular aliases. - Update the `isInteresting` test to follow more types. Previously the test was too strict so some cycles were missed. - Make -explain-cyclic also explain for cycles detected by this check. Fixes #19372 [Cherry-picked 756ae34]
[Cherry-picked 1354d0d]
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No regressions detected in the community build up to lts-19520. |
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Backports #19453 to the LTS branch.
PR submitted by the release tooling.
[skip ci]