RFR: 8280041: Retry loop issues in java.io.ClassCache

[Aleksey Shipilev]

On Fri, 14 Jan 2022 20:50:24 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> One additional improvement would be to change r.get() == null to r.refersTo(null) to check for cleared reference, that avoids reviving the referent, e.g. in SATB GCs. I leave that up to you.

I think that does not work, because we want to strongly reference the `val` for eventual return.

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PR: https://git.openjdk.java.net/jdk/pull/7092