Backport "Avoid using the current denotation in NamedType.disambiguate" to 3.3 LTS #28
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While recalculating denotation in NamedType we might call NamedType.disambiguate which uses a denotation to decide about the correct overloaded method. Using current denotation here might cause stale symbol errors, so instead we use the lastKnownDenotation, which should be enough for the use case here, as targetName should not change between phases/runs. Later in the denotation recalculation a similar thing happens with SourceLanguage.apply, where we also now avoid using currentDenotation, as whether the symbol comes from java or Scala 2 should also not change between phases/runs. [Cherry-picked 6e58d25]
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Backports scala#21414 to the 3.3.6.
PR submitted by the release tooling.
[skip ci]