Replace sun.misc.Unsafe used in LazyVals with VarHandles#24109

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jchyb wants to merge 7 commits intoscala:mainfrom

dotty-staging:lazyval-varhandle

Commits on Oct 5, 2025

Inline the cas method and remove the change from stdlib
jchyb
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Commits on Oct 6, 2025

Set minimum JDK version for -release flag to java 17
jchyb
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