[jdk17u] RFR: 8277981: String Deduplication table is never cleaned up due to bad dead_factor_for_cleanup

[Aleksey Shipilev]

On Wed, 1 Dec 2021 13:53:29 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to fix a math problem in strdedup heuristics that leads to observable memory leaks.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `tier1` with `-XX:+UseStringDeduplication`
>  - [x] Linux x86_64 fastdebug `tier2` with `-XX:+UseStringDeduplication`
>  - [x] Linux x86_64 fastdebug `tier3` with `-XX:+UseStringDeduplication`

Got the push approval for 17.0.2.

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PR: https://git.openjdk.java.net/jdk17u/pull/316